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• 241. [Article] The Siletz Indian Reservation, 1855-1900

  The aim of my study was to try to bring forth the basic aspects and characteristics of the Siletz Reservation as it was in the nineteenth century. Concentration was placed on the life activities and concerns ...

  Citation × Citation Citation Abstract Copy Title: The Siletz Indian Reservation, 1855-1900 Author: Kent, William Eugene Year: 1973 The aim of my study was to try to bring forth the basic aspects and characteristics of the Siletz Reservation as it was in the nineteenth century. Concentration was placed on the life activities and concerns of a typical resident, while at the same time extremes in behavior and actions were also noted. Thus an entire spectrum of human life was recreated. Government policies and events and changes of the time were noted as to how they affected the life at the reservation. I did not include all of the information available to me .and all information is not known by any single authority or source of information. I feel that I have presented a broad and, satisfactory picture of my topic. It is hoped that someday more information and insight will be presented that will add depth to my initial study. Also out of necessity I could only briefly cover many topics which could easily be worthwhile covering in more detail. Thus there is more ground to cover. Despite its importance, there is correspondingly not much written about the Siletz Reservation. This is largely probably due to the fact that the reservation fades fast from a center of attention. The population fell below five hundred by the turn of the century, thus making the place far from a population center. A second factor was that the people became a new people in a new world and so, instead of continuing to be a home to change Indians, it was merely a home for people who lived like other Americans but were Indian by heart and appearance. Aside from a few studies and sources of information, there are two main sources of information. The first is the annual reports sent to the Secretary of Interior. These can be found in any major library. The second source is the manuscripts. These are the records and correspondence of the agency. The Siletz Manuscripts are in six boxes at the Oregon Historical Society Library in Portland. The material is unorganized and much of it is damaged. There is also material not related to Siletz. Some of Joel Palmer's Indian Treaties are there as well as quite a lot of records of the Grand Ronde Reservation. Unfortunately, it is largely correspondence to the Agency rather than that sent out. The government archives may have some of the correspondence. As every student and author knows, writing poses many problems. There are any number of ways to put together a study of this kind. I divided mine into three basic parts. The first section is a year by year analysis. The second is topic by topic, and finally the third is again yearly. This helped me keep on the general topic of the reservation itself while still being able to diverge and enlarge on important issues. It was a challenging and rewarding task which I hope will be enjoyed by others and will add to their knowledge and understanding of the Siletz Indians and their life on the Reservation. Title: The Siletz Indian Reservation, 1855-1900 Author: Kent, William Eugene Year: 1973 The aim of my study was to try to bring forth the basic aspects and characteristics of the Siletz Reservation as it was in the nineteenth century. Concentration was placed on the life activities and concerns of a typical resident, while at the same time extremes in behavior and actions were also noted. Thus an entire spectrum of human life was recreated. Government policies and events and changes of the time were noted as to how they affected the life at the reservation. I did not include all of the information available to me .and all information is not known by any single authority or source of information. I feel that I have presented a broad and, satisfactory picture of my topic. It is hoped that someday more information and insight will be presented that will add depth to my initial study. Also out of necessity I could only briefly cover many topics which could easily be worthwhile covering in more detail. Thus there is more ground to cover. Despite its importance, there is correspondingly not much written about the Siletz Reservation. This is largely probably due to the fact that the reservation fades fast from a center of attention. The population fell below five hundred by the turn of the century, thus making the place far from a population center. A second factor was that the people became a new people in a new world and so, instead of continuing to be a home to change Indians, it was merely a home for people who lived like other Americans but were Indian by heart and appearance. Aside from a few studies and sources of information, there are two main sources of information. The first is the annual reports sent to the Secretary of Interior. These can be found in any major library. The second source is the manuscripts. These are the records and correspondence of the agency. The Siletz Manuscripts are in six boxes at the Oregon Historical Society Library in Portland. The material is unorganized and much of it is damaged. There is also material not related to Siletz. Some of Joel Palmer's Indian Treaties are there as well as quite a lot of records of the Grand Ronde Reservation. Unfortunately, it is largely correspondence to the Agency rather than that sent out. The government archives may have some of the correspondence. As every student and author knows, writing poses many problems. There are any number of ways to put together a study of this kind. I divided mine into three basic parts. The first section is a year by year analysis. The second is topic by topic, and finally the third is again yearly. This helped me keep on the general topic of the reservation itself while still being able to diverge and enlarge on important issues. It was a challenging and rewarding task which I hope will be enjoyed by others and will add to their knowledge and understanding of the Siletz Indians and their life on the Reservation. Close

• 242. [Article] Writing Chinuk Wawa: A Materials Development Case Study

  This study explored the development of new texts by fluent non-native speakers of Chinuk Wawa, an endangered indigenous contact language of the Pacific Northwest United States. The texts were developed ...

  Citation × Citation Citation Abstract Copy Title: Writing Chinuk Wawa: A Materials Development Case Study Author: Hamilton, Sarah A. Braun Year: 2010 This study explored the development of new texts by fluent non-native speakers of Chinuk Wawa, an endangered indigenous contact language of the Pacific Northwest United States. The texts were developed as part of the language and culture program of the Confederated Tribes of the Grand Ronde Community of Oregon for use in university-sponsored language classes. The collaborative process of developing 12 texts was explored through detailed revision analysis and interviews with the materials developers and other stakeholders. Fluent non-native speakers relied on collaboration, historical documentation, reference materials, grammatical models, and their own intuitions and cultural sensibilities to develop texts that would be both faithful to the speech of previous generations and effective for instruction. The texts studied were stories and cultural information developed through research-based composition, translation from interlinear and narrative English in ethnographic sources, and editing of transcribed oral narrative. The revision analysis identified points of discussion in the lexical development and grammatical standardization of the language. The preferred strategy for developing new vocabulary was use of language-internal resources such as compounding although borrowing and loan translation from other local Native languages were also sometimes considered appropriate. The multifunctionality of the lexicon and evidence of dialectal and idiolectal usage problematicized the description of an “ideal” language for pedagogical purposes. Concerns were also expressed about detailed grammatical modeling due to potential influence on non-native speaker intuitions and the non-utility of such models for revitalization goals. Decisions made in the process of developing texts contributed to the development of a written form of Chinuk Wawa that would honor and perpetuate the oral language while adapting it for the requirements of inscription. The repeated inclusion of discourse markers and the frequent removal of nominal reference brought final versions of texts closer to oral style, while inclusion of background information and the avoidance of shortened pronouns and auxiliaries customized the presentation for a reading audience. The results of this study comprise a sketch of one aspect of the daily work of language revitalization, in which non-native speakers shoulder responsibility for the growth of a language and its transfer to new generations of speakers. Title: Writing Chinuk Wawa: A Materials Development Case Study Author: Hamilton, Sarah A. Braun Year: 2010 This study explored the development of new texts by fluent non-native speakers of Chinuk Wawa, an endangered indigenous contact language of the Pacific Northwest United States. The texts were developed as part of the language and culture program of the Confederated Tribes of the Grand Ronde Community of Oregon for use in university-sponsored language classes. The collaborative process of developing 12 texts was explored through detailed revision analysis and interviews with the materials developers and other stakeholders. Fluent non-native speakers relied on collaboration, historical documentation, reference materials, grammatical models, and their own intuitions and cultural sensibilities to develop texts that would be both faithful to the speech of previous generations and effective for instruction. The texts studied were stories and cultural information developed through research-based composition, translation from interlinear and narrative English in ethnographic sources, and editing of transcribed oral narrative. The revision analysis identified points of discussion in the lexical development and grammatical standardization of the language. The preferred strategy for developing new vocabulary was use of language-internal resources such as compounding although borrowing and loan translation from other local Native languages were also sometimes considered appropriate. The multifunctionality of the lexicon and evidence of dialectal and idiolectal usage problematicized the description of an “ideal” language for pedagogical purposes. Concerns were also expressed about detailed grammatical modeling due to potential influence on non-native speaker intuitions and the non-utility of such models for revitalization goals. Decisions made in the process of developing texts contributed to the development of a written form of Chinuk Wawa that would honor and perpetuate the oral language while adapting it for the requirements of inscription. The repeated inclusion of discourse markers and the frequent removal of nominal reference brought final versions of texts closer to oral style, while inclusion of background information and the avoidance of shortened pronouns and auxiliaries customized the presentation for a reading audience. The results of this study comprise a sketch of one aspect of the daily work of language revitalization, in which non-native speakers shoulder responsibility for the growth of a language and its transfer to new generations of speakers. Close

• 243. [Article] Partial melting of tonalite at the margins of a Columbia River Basalt Group dike, Wallowa Mountains, northeastern Oregon

  Columbia River Basalt Group dikes cut the tonalite-granodiorite Wallowa Batholith in northeastern Oregon, providing a natural setting in which to examine partial melting. Many dikes have up to 5 m-wide ...

  Citation × Citation Citation Abstract Copy Title: Partial melting of tonalite at the margins of a Columbia River Basalt Group dike, Wallowa Mountains, northeastern Oregon Author: Petcovic, Heather L. Columbia River Basalt Group dikes cut the tonalite-granodiorite Wallowa Batholith in northeastern Oregon, providing a natural setting in which to examine partial melting. Many dikes have up to 5 m-wide zones of quenched partially melted wallrock at their margins. This paper examines the progressive partial melting reactions in biotite-and hornblende-bearing tonalite at the margin of a near-vertical Grande Ronde dike in the vicinity of Maxwell Lake. Paleodepth at the time of dike emplacement is estimated at 1- 2 km, and dike temperature was about 1140°C. Samples collected from the dike margin represent five successive stages of melt reaction over a distance of about 5 m from unmolten wallrock (Stage 1) to about 40 volume percent (vol%) quenched melt (Stage 5). This melt is now represented by about 31 vol% silicic glass that has undergone little to no devitrification and about 9 vol% plagioclase, pyroxene, and Fe-Ti oxide quench crystals. Whole rock major and trace element bulk compositional data are nearly identical to unmolten rock at each stage, suggesting that the melt did not separate from the restite and each stage represents essentially a chemically closed system. With progressive melting, primary hornblende, biotite, and orthoclase are entirely consumed but residual plagioclase, quartz, Fe-Ti oxides and apatite persist in the restite. Hornblende dehydration initially produces a dusty intergrowth of augite, pigeonite, lesser enstatite, and sparse Fe-Ti oxides. Initial biotite dehydration produces titaniferous magnetite and lesser ilmenite aligned in bands in an intergrowth of enstatite and plagioclase. Andesine plagioclase develops a spongy texture as the albite component is lost to the melt. Reaction of hornblende, quartz, and feldspar produces sparse tonalitic (high-Ca) glass, while the reaction of biotite, quartz, and feldspar produces abundant granitic (high-K) glass. The two glass types are irregularly distributed around mafic reaction sites and in up to 2 mm seams on quartz-feldspar contacts. With progressive melting, replacement phases become compositionally more homogeneous, clinopyroxene is consumed, the proportion of plagioclase decreases, and glasses become slightly more mafic. Granitic and tonalitic glasses persist in just over 31 vol% glass suggesting that deformation is required to mix these melt types. Title: Partial melting of tonalite at the margins of a Columbia River Basalt Group dike, Wallowa Mountains, northeastern Oregon Author: Petcovic, Heather L. Columbia River Basalt Group dikes cut the tonalite-granodiorite Wallowa Batholith in northeastern Oregon, providing a natural setting in which to examine partial melting. Many dikes have up to 5 m-wide zones of quenched partially melted wallrock at their margins. This paper examines the progressive partial melting reactions in biotite-and hornblende-bearing tonalite at the margin of a near-vertical Grande Ronde dike in the vicinity of Maxwell Lake. Paleodepth at the time of dike emplacement is estimated at 1- 2 km, and dike temperature was about 1140°C. Samples collected from the dike margin represent five successive stages of melt reaction over a distance of about 5 m from unmolten wallrock (Stage 1) to about 40 volume percent (vol%) quenched melt (Stage 5). This melt is now represented by about 31 vol% silicic glass that has undergone little to no devitrification and about 9 vol% plagioclase, pyroxene, and Fe-Ti oxide quench crystals. Whole rock major and trace element bulk compositional data are nearly identical to unmolten rock at each stage, suggesting that the melt did not separate from the restite and each stage represents essentially a chemically closed system. With progressive melting, primary hornblende, biotite, and orthoclase are entirely consumed but residual plagioclase, quartz, Fe-Ti oxides and apatite persist in the restite. Hornblende dehydration initially produces a dusty intergrowth of augite, pigeonite, lesser enstatite, and sparse Fe-Ti oxides. Initial biotite dehydration produces titaniferous magnetite and lesser ilmenite aligned in bands in an intergrowth of enstatite and plagioclase. Andesine plagioclase develops a spongy texture as the albite component is lost to the melt. Reaction of hornblende, quartz, and feldspar produces sparse tonalitic (high-Ca) glass, while the reaction of biotite, quartz, and feldspar produces abundant granitic (high-K) glass. The two glass types are irregularly distributed around mafic reaction sites and in up to 2 mm seams on quartz-feldspar contacts. With progressive melting, replacement phases become compositionally more homogeneous, clinopyroxene is consumed, the proportion of plagioclase decreases, and glasses become slightly more mafic. Granitic and tonalitic glasses persist in just over 31 vol% glass suggesting that deformation is required to mix these melt types. Close

• 244. [Article] Sequence stratigraphy and lithofacies of the middle Eocene upper McIntosh and Cowlitz Formations, geology of the Grays River Volcanics, Castle Rock - Germany Creek area, southwest Washington

  A composite 732-rn thick section in Germany Creek of middle Eocene upper McIntosh and lower Cowlitz Formations, as well as the lower Grays River Volcanics, was studied using bio-, magneto- and lithostratigraphy ...

  Citation × Citation Citation Abstract Copy Title: Sequence stratigraphy and lithofacies of the middle Eocene upper McIntosh and Cowlitz Formations, geology of the Grays River Volcanics, Castle Rock - Germany Creek area, southwest Washington Author: Kleibacker, Derik W. A composite 732-rn thick section in Germany Creek of middle Eocene upper McIntosh and lower Cowlitz Formations, as well as the lower Grays River Volcanics, was studied using bio-, magneto- and lithostratigraphy to construct a sequence stratigraphic framework and assess hydrocarbon exploration potential. The upper McIntosh Formation forms a complete 3rd order depositional cycle that includes shallow marine, tide- and wave-dominated sandstones (upper McIntosh sandstone member) and overlying bathyal to outer-shelf siltstone (upper Mcintosh siltsone member). The upper McIntosh Formation coffelates to Chrons C19r (41.5 -42.5 Ma) and lower Chron 19n (41.5-41.2 Ma). A 31 order sequence boundary straddling Chron 19n (41.2-41.5 Ma) shows truncation of the highstand upper McIntosh siltstone by prograding lowstand shoreface parasequences of the lower Cowlitz Formation. The overlying (300 m thick) shoreface transgressive (TST) and highstand system tracts (HST) of the Cowlitz Formation range in age from 41.5-41.2 Ma to 39.35 ±0.36 Ma. The Cowlitz Formation HST of the study area chronostratigraphically correlates to the reservoir Clark arid Wilson sandstone member of the Mist Gas Field Cowlitz Formation and to informal unit 1A and lower unit lB of the type-Cowlitz Formation, southwest Washington. The Grays River Volcanics of the study area are subdivided by an intraformational unconformity defining the upper (~150-m thick; 38.6-36.8 Ma) and lower (1250-m thick; 40.1-39 Ma) Grays River Volcanics subunits. Two subalkaline olivine- augite tholeiitic basalt flows of the lower Grays River Volcanics conformably overlying the Cowlitz Formation in Germany Creek were 40Ar/39Ar dated at 40.09 ±0.34 Ma and 39.35 ±0.36 Ma. The tholeiitic upper Grays River basalt unconformably overlies the lower Grays River Volcanics and the Cowlitz Formation. Numerous sub-parallel, northeast and minor northwest trending Grays River dikes (40Ar/39Ar dated at 39.98 ±0.29 and 39.56 ±0.41 Ma) attest to extension of the study area during the eruption of the Grays River Volcanics. The Oligocene Lincoln Creek Formation (~70m) consists of bioturbated tuffaceous siltstone and interbedded silty sandstone with casts and molds of articulated mollusks. Geochemistry, normal polarity, and dikytaxitic texture of the 50-60 m thick Grande Ronde basalt are indicative of the Sentinel Bluffs unit (15.6 Ma) (Columbia River Basalt Group). The Arkansas Anticline and three fault sets: (1) north-northwest- and (2) northwest-trending dextral oblique-slip faults, and (3) subordinate northeast-trending conjugate sinistral oblique-slip faults are related to two periods of deformation. They are: (1) dextral transtension resulting in horst and graben style faulting, beginning 40-39.5 Ma and terminating prior to the eruption of the upper Grays River volcanics (38.6 Ma); (2) post-middle Miocene period of dextral transpression, including dextral reactivation of normal faults and associated broad regional northwest-trending folding (e.g. Arkansas Anticline). Small normal fault block similar to the Mist Gas Field provide structural traps throughout southwest Washington. Petrography of micaceous lithic arkoses of the upper McIntosh sandstone and Cowlitz Formation indicates reservoir-quality sandstones with an estimated porosity of 16-19%. The most likely hydrocarbon exploration play involves the subtidal to shoreface upper McIntosh Formation sandstone member. Title: Sequence stratigraphy and lithofacies of the middle Eocene upper McIntosh and Cowlitz Formations, geology of the Grays River Volcanics, Castle Rock - Germany Creek area, southwest Washington Author: Kleibacker, Derik W. A composite 732-rn thick section in Germany Creek of middle Eocene upper McIntosh and lower Cowlitz Formations, as well as the lower Grays River Volcanics, was studied using bio-, magneto- and lithostratigraphy to construct a sequence stratigraphic framework and assess hydrocarbon exploration potential. The upper McIntosh Formation forms a complete 3rd order depositional cycle that includes shallow marine, tide- and wave-dominated sandstones (upper McIntosh sandstone member) and overlying bathyal to outer-shelf siltstone (upper Mcintosh siltsone member). The upper McIntosh Formation coffelates to Chrons C19r (41.5 -42.5 Ma) and lower Chron 19n (41.5-41.2 Ma). A 31 order sequence boundary straddling Chron 19n (41.2-41.5 Ma) shows truncation of the highstand upper McIntosh siltstone by prograding lowstand shoreface parasequences of the lower Cowlitz Formation. The overlying (300 m thick) shoreface transgressive (TST) and highstand system tracts (HST) of the Cowlitz Formation range in age from 41.5-41.2 Ma to 39.35 ±0.36 Ma. The Cowlitz Formation HST of the study area chronostratigraphically correlates to the reservoir Clark arid Wilson sandstone member of the Mist Gas Field Cowlitz Formation and to informal unit 1A and lower unit lB of the type-Cowlitz Formation, southwest Washington. The Grays River Volcanics of the study area are subdivided by an intraformational unconformity defining the upper (~150-m thick; 38.6-36.8 Ma) and lower (1250-m thick; 40.1-39 Ma) Grays River Volcanics subunits. Two subalkaline olivine- augite tholeiitic basalt flows of the lower Grays River Volcanics conformably overlying the Cowlitz Formation in Germany Creek were 40Ar/39Ar dated at 40.09 ±0.34 Ma and 39.35 ±0.36 Ma. The tholeiitic upper Grays River basalt unconformably overlies the lower Grays River Volcanics and the Cowlitz Formation. Numerous sub-parallel, northeast and minor northwest trending Grays River dikes (40Ar/39Ar dated at 39.98 ±0.29 and 39.56 ±0.41 Ma) attest to extension of the study area during the eruption of the Grays River Volcanics. The Oligocene Lincoln Creek Formation (~70m) consists of bioturbated tuffaceous siltstone and interbedded silty sandstone with casts and molds of articulated mollusks. Geochemistry, normal polarity, and dikytaxitic texture of the 50-60 m thick Grande Ronde basalt are indicative of the Sentinel Bluffs unit (15.6 Ma) (Columbia River Basalt Group). The Arkansas Anticline and three fault sets: (1) north-northwest- and (2) northwest-trending dextral oblique-slip faults, and (3) subordinate northeast-trending conjugate sinistral oblique-slip faults are related to two periods of deformation. They are: (1) dextral transtension resulting in horst and graben style faulting, beginning 40-39.5 Ma and terminating prior to the eruption of the upper Grays River volcanics (38.6 Ma); (2) post-middle Miocene period of dextral transpression, including dextral reactivation of normal faults and associated broad regional northwest-trending folding (e.g. Arkansas Anticline). Small normal fault block similar to the Mist Gas Field provide structural traps throughout southwest Washington. Petrography of micaceous lithic arkoses of the upper McIntosh sandstone and Cowlitz Formation indicates reservoir-quality sandstones with an estimated porosity of 16-19%. The most likely hydrocarbon exploration play involves the subtidal to shoreface upper McIntosh Formation sandstone member. Close

• 245. [Article] Susceptibility of select salmonids to Myxobolus cerebralis and effects of exposure on anadromous salmonids in Oregon

  Myxobolus cerebralis, a myxozoan parasite of salmonids, is the causative agent of whirling disease. The parasite is considered widespread throughout northeastern Oregon in the Grande Ronde and Imnaha River ...

  Citation × Citation Citation Abstract Copy Title: Susceptibility of select salmonids to Myxobolus cerebralis and effects of exposure on anadromous salmonids in Oregon Author: Sollid, Sarah A. Myxobolus cerebralis, a myxozoan parasite of salmonids, is the causative agent of whirling disease. The parasite is considered widespread throughout northeastern Oregon in the Grande Ronde and Imnaha River basins where threatened and endangered salmonid populations exist. The work presented in this thesis comprises several studies that assess the effects of M. cerebralis on resident and anadromous salmonids in Oregon. Laboratory challenges to determine the susceptibility of indigenous Deschutes River, Oregon, salmonids to M. cerebralis were conducted as part of a study to assess the risk of reintroducing anadromous salmon above a migration barrier on that river. This study was the first to assess the susceptibility of kokanee salmon Oncorhynchus nerka to M. cerebralis, and results contribute to the understanding of salmonid susceptibility as it relates to species and age. Further, this study demonstrates that the indigenous salmonids present in the river are susceptible to infection, but resident rainbow trout Oncorhynchus mykiss would be most at risk should introduction of M. cerebralis occur in this system. The susceptibility of chinook salmon Oncorhynchus tshawytscha to M. cerebralis was assessed following laboratory challenges at different ages to different parasite levels. Results from this study indicate that chinook salmon are more resistant to M. cerebralis infection than susceptible rainbow trout; resistance to disease developed in chinook salmon exposed after 3 weeks of age. Sustained exposures to a low parasite dose were performed to model the conditions chinook salmon would encounter in a natural exposure. Following continuous exposure to low parasite densities, chinook salmon were very resistant to infection and disease. Managed populations of chinook salmon and steelhead Oncorhynchus mykiss juveniles are held in acclimation facilities on their natal streams before release to commence their seaward migration. Rainbow trout fry were held at each of the acclimation facilities to detect the presence of M. cerebralis and to assess the prevalence of exposure during the acclimation period. Results from these exposures indicate that the Wallowa acclimation facility is a high-risk site for parasite exposure of steelhead juveniles. Further, detection was confirmed in several rivers and streams where the presence of M. cerebralis has been suggested. Finally, a preliminary study on the effect of M. cerebralis on survival of steelhead juveniles upon transfer to saltwater was conducted. Results from this study indicate that M. cerebralis exposure and infection may increase mortality among juvenile steelhead during saltwater adaptation. Title: Susceptibility of select salmonids to Myxobolus cerebralis and effects of exposure on anadromous salmonids in Oregon Author: Sollid, Sarah A. Myxobolus cerebralis, a myxozoan parasite of salmonids, is the causative agent of whirling disease. The parasite is considered widespread throughout northeastern Oregon in the Grande Ronde and Imnaha River basins where threatened and endangered salmonid populations exist. The work presented in this thesis comprises several studies that assess the effects of M. cerebralis on resident and anadromous salmonids in Oregon. Laboratory challenges to determine the susceptibility of indigenous Deschutes River, Oregon, salmonids to M. cerebralis were conducted as part of a study to assess the risk of reintroducing anadromous salmon above a migration barrier on that river. This study was the first to assess the susceptibility of kokanee salmon Oncorhynchus nerka to M. cerebralis, and results contribute to the understanding of salmonid susceptibility as it relates to species and age. Further, this study demonstrates that the indigenous salmonids present in the river are susceptible to infection, but resident rainbow trout Oncorhynchus mykiss would be most at risk should introduction of M. cerebralis occur in this system. The susceptibility of chinook salmon Oncorhynchus tshawytscha to M. cerebralis was assessed following laboratory challenges at different ages to different parasite levels. Results from this study indicate that chinook salmon are more resistant to M. cerebralis infection than susceptible rainbow trout; resistance to disease developed in chinook salmon exposed after 3 weeks of age. Sustained exposures to a low parasite dose were performed to model the conditions chinook salmon would encounter in a natural exposure. Following continuous exposure to low parasite densities, chinook salmon were very resistant to infection and disease. Managed populations of chinook salmon and steelhead Oncorhynchus mykiss juveniles are held in acclimation facilities on their natal streams before release to commence their seaward migration. Rainbow trout fry were held at each of the acclimation facilities to detect the presence of M. cerebralis and to assess the prevalence of exposure during the acclimation period. Results from these exposures indicate that the Wallowa acclimation facility is a high-risk site for parasite exposure of steelhead juveniles. Further, detection was confirmed in several rivers and streams where the presence of M. cerebralis has been suggested. Finally, a preliminary study on the effect of M. cerebralis on survival of steelhead juveniles upon transfer to saltwater was conducted. Results from this study indicate that M. cerebralis exposure and infection may increase mortality among juvenile steelhead during saltwater adaptation. Close

• 246. [Article] Spatial patterns of fuel management activities and their effects on wildfire behavior

  Fuel management has been used as an effective local strategy to reduce the undesirable consequences of wildfires. Many efforts toward scheduling of fuel management activities across a broader landscape ...

  Citation × Citation Citation Abstract Copy Title: Spatial patterns of fuel management activities and their effects on wildfire behavior Author: Kim, Young-Hwan Fuel management has been used as an effective local strategy to reduce the undesirable consequences of wildfires. Many efforts toward scheduling of fuel management activities across a broader landscape have been proposed, with the hope of achieving larger landscape-scale management effects. However, scheduling of fuel management treatments across the broader landscape is limited by understandings of how individual management activities aggregate to larger scales and how they affect the behavior of wildfires. Since full coverage of a landscape with fuels management treatments is unlikely, it is necessary to examine the effects of a spatial pattern of individual management activities at the landscape scale. In this research, four spatial patterns of fuel management activities – dispersed, clumped, random, and regular – were tested to investigate their potential for reducing the risk of severe wildfire. A new methodology was developed for optimizing fuel management patterns across a landscape based on a heuristic technique and GIS databases. To quantify the cumulative effects of fuel management patterns for disrupting the progress of wildfires, overall flame length, fireline intensity, and fire size were measured for simulated fires, using a fire growth simulation model, FARSITE. The management scenarios generated from the scheduling model presented a variety of dispersion and treatment sizes, but also evenly distributed the harvest volume through the multi-decade time horizon. The optimized spatial patterns were qualified through visual examination as well as a statistical assessment. Through this research, I have learned that the efficiency of fuels management activities for reducing severity of wildfire is primarily influenced by treatment size, type, and intensity. Most importantly, treatment types and intensity are the critical factor to disrupt human-caused wildfires. The regular pattern seemed to be the most acceptable for either random ignitions or hypothetical human-caused ignitions. It provided the highest frequency in which simulated fires could contact the treated units, and higher treatment intensity measured by amount of harvested volume from a unit area. To enhance the results of this research, we suggest that one should utilize more feasible management prescriptions for post-fire fuel conditions, and expand ignition sources to other type of human-caused ignitions or natural-caused ignitions. Title: Spatial patterns of fuel management activities and their effects on wildfire behavior Author: Kim, Young-Hwan Fuel management has been used as an effective local strategy to reduce the undesirable consequences of wildfires. Many efforts toward scheduling of fuel management activities across a broader landscape have been proposed, with the hope of achieving larger landscape-scale management effects. However, scheduling of fuel management treatments across the broader landscape is limited by understandings of how individual management activities aggregate to larger scales and how they affect the behavior of wildfires. Since full coverage of a landscape with fuels management treatments is unlikely, it is necessary to examine the effects of a spatial pattern of individual management activities at the landscape scale. In this research, four spatial patterns of fuel management activities – dispersed, clumped, random, and regular – were tested to investigate their potential for reducing the risk of severe wildfire. A new methodology was developed for optimizing fuel management patterns across a landscape based on a heuristic technique and GIS databases. To quantify the cumulative effects of fuel management patterns for disrupting the progress of wildfires, overall flame length, fireline intensity, and fire size were measured for simulated fires, using a fire growth simulation model, FARSITE. The management scenarios generated from the scheduling model presented a variety of dispersion and treatment sizes, but also evenly distributed the harvest volume through the multi-decade time horizon. The optimized spatial patterns were qualified through visual examination as well as a statistical assessment. Through this research, I have learned that the efficiency of fuels management activities for reducing severity of wildfire is primarily influenced by treatment size, type, and intensity. Most importantly, treatment types and intensity are the critical factor to disrupt human-caused wildfires. The regular pattern seemed to be the most acceptable for either random ignitions or hypothetical human-caused ignitions. It provided the highest frequency in which simulated fires could contact the treated units, and higher treatment intensity measured by amount of harvested volume from a unit area. To enhance the results of this research, we suggest that one should utilize more feasible management prescriptions for post-fire fuel conditions, and expand ignition sources to other type of human-caused ignitions or natural-caused ignitions. Close

• 247. [Article] Fish movement and assemblage dynamics in a Pacific Northwest riverscape

  This study examined fish movements and assemblage dynamics in the Wenaha, Grande Ronde, Snake river system of northeast Oregon and southeast Washington. I investigated the role of fish movement in the ...

  Citation × Citation Citation Abstract Copy Title: Fish movement and assemblage dynamics in a Pacific Northwest riverscape Author: Baxter, Colden V. This study examined fish movements and assemblage dynamics in the Wenaha, Grande Ronde, Snake river system of northeast Oregon and southeast Washington. I investigated the role of fish movement in the dynamics of stream fish assemblages and evaluated relationships between species movement, assemblage structure, and the heterogeneity of habitat at multiple scales within the river network. In doing so, I employed a landscape approach, visualizing the heterogeneity and dynamics of the system as a "riverscape" that sets the stage for the ecology of stream fishes. I quantified fish assemblage dynamics, characterized the nature and extent of movement by representative fish species, and assessed spatial and temporal heterogeneity of stream habitat within the river network. I applied multiple methods, including underwater fish surveys and radio telemetry, and used multiple sampling approaches that allowed me to detect patterns at nested spatial and temporal scales. I found that spatial patterns in fish assemblage structure were highly dynamic over seasonal to diel temporal scales. Seasonal changes in fish assemblage patterns along the length of the river system were primarily driven by the migration of native fishes such as mountain whitefish, bull trout, and largescale suckers. These highly migratory species exhibited a diverse array of movement strategies and often had annual ranges of hundreds of kilometers. The movement of fishes at smaller spatial scales influenced diel dynamics of fish assemblage patterns. Important habitat features at stream, valley segment and channel unit scales were separated spatially, and fish species exhibited a variety of migratory strategies that reflected the complementary use of habitats distributed throughout the riverscape. The importance of fish migration and the dynamic nature of stream fish assemblages and fish habitat relationships should be taken into account in research and conservation of stream fishes. Current conceptual frameworks for stream fish assemblages do not fully reflect the temporal complexity of stream fish life histories or the spatial heterogeneity of stream habitat. I introduce an alternative framework by integrating fish movement into a dynamic perspective of assemblages set within the context of the riverscape, and raise questions regarding the nature of ecological communities. Title: Fish movement and assemblage dynamics in a Pacific Northwest riverscape Author: Baxter, Colden V. This study examined fish movements and assemblage dynamics in the Wenaha, Grande Ronde, Snake river system of northeast Oregon and southeast Washington. I investigated the role of fish movement in the dynamics of stream fish assemblages and evaluated relationships between species movement, assemblage structure, and the heterogeneity of habitat at multiple scales within the river network. In doing so, I employed a landscape approach, visualizing the heterogeneity and dynamics of the system as a "riverscape" that sets the stage for the ecology of stream fishes. I quantified fish assemblage dynamics, characterized the nature and extent of movement by representative fish species, and assessed spatial and temporal heterogeneity of stream habitat within the river network. I applied multiple methods, including underwater fish surveys and radio telemetry, and used multiple sampling approaches that allowed me to detect patterns at nested spatial and temporal scales. I found that spatial patterns in fish assemblage structure were highly dynamic over seasonal to diel temporal scales. Seasonal changes in fish assemblage patterns along the length of the river system were primarily driven by the migration of native fishes such as mountain whitefish, bull trout, and largescale suckers. These highly migratory species exhibited a diverse array of movement strategies and often had annual ranges of hundreds of kilometers. The movement of fishes at smaller spatial scales influenced diel dynamics of fish assemblage patterns. Important habitat features at stream, valley segment and channel unit scales were separated spatially, and fish species exhibited a variety of migratory strategies that reflected the complementary use of habitats distributed throughout the riverscape. The importance of fish migration and the dynamic nature of stream fish assemblages and fish habitat relationships should be taken into account in research and conservation of stream fishes. Current conceptual frameworks for stream fish assemblages do not fully reflect the temporal complexity of stream fish life histories or the spatial heterogeneity of stream habitat. I introduce an alternative framework by integrating fish movement into a dynamic perspective of assemblages set within the context of the riverscape, and raise questions regarding the nature of ecological communities. Close

• 248. [Article] Potential Impacts of Formation Waters on the Integrity of Class H Cement and Reservoir Rock in Carbon (Co-)Sequestration Settings

  The focus of this research is to characterize the risk of carbon sequestration under downhole conditions with regards to wellbore cement integrity. The primary research objective was to understand the ...

  Citation × Citation Citation Abstract Copy Title: Potential Impacts of Formation Waters on the Integrity of Class H Cement and Reservoir Rock in Carbon (Co-)Sequestration Settings Author: Verba, Circe Year: 2013 The focus of this research is to characterize the risk of carbon sequestration under downhole conditions with regards to wellbore cement integrity. The primary research objective was to understand the geochemical interactions of simulated sequestration brines and wellbore cement. There are four key focuses of this study with regards to cement interaction: 1) Simulated brines saturated with Supercritical CO2 and CO2-O2; 2) Adjacent formation host rock under sequestration conditions; 3) Geochemical modeling using CHIM-XPT based on the experimental studies of points 1) and 2) above; 4) Geomechanical strength tests of CO2 exposed cements. First, the interaction of cement with supercritical CO2, CO2-saturated brines, and CO2-O2 mixtures at 50 °C, 85 °C, and 28.9 MPa was evaluated. Cement exposed to a lower salinity brine (1 M) had a larger alteration depth (1.25 mm) compared to cement exposed to a higher salinity brine (2.2 M) (0.836 mm). CO2-O2 exposed cements displayed alteration depths of 1.6 mm at 85 °C and 0.7 mm at 50 °C for 1 M. The cement exposed to the 2.17 M solution had an alteration extending 1.685 mm. The second focus studied the influence of adjacent formations and observed mineral trapping in the Grande Ronde Basalt-cement. Studies of Mt. Simon Sandstone-cement interaction provided evidence for high CO2 storage capacity. The third focus is geochemical modeling using CHIM-XPT. Pure CO2 saturated brines yielded a pH of 3.0 at 1 M and 3.85 at 2.17 M. The CO2-O2 gas run calculated a pH of 3.96 at 1 M and 3.85 at 2.17 M. The Pasco solution after exposure had a pH of 6.97 and an estimated dissolved 161 g of CO2 (g). The pH of the Illinois Basin brine and Mt. Simon sandstone [and cement paste] was 5.8 with an estimated 139 g of CO2 consumed. Lastly, geomechanical tests on CO2 exposed cements indicated that addition of oxygen or changes in temperature play a key role in compressive and tensile strength, decreasing strength by 20-35%. This research highlighted the importance of representing the in-situ wellbore environment when conducting laboratory experiments. This dissertation includes previously published and unpublished co-authored material. Title: Potential Impacts of Formation Waters on the Integrity of Class H Cement and Reservoir Rock in Carbon (Co-)Sequestration Settings Author: Verba, Circe Year: 2013 The focus of this research is to characterize the risk of carbon sequestration under downhole conditions with regards to wellbore cement integrity. The primary research objective was to understand the geochemical interactions of simulated sequestration brines and wellbore cement. There are four key focuses of this study with regards to cement interaction: 1) Simulated brines saturated with Supercritical CO2 and CO2-O2; 2) Adjacent formation host rock under sequestration conditions; 3) Geochemical modeling using CHIM-XPT based on the experimental studies of points 1) and 2) above; 4) Geomechanical strength tests of CO2 exposed cements. First, the interaction of cement with supercritical CO2, CO2-saturated brines, and CO2-O2 mixtures at 50 °C, 85 °C, and 28.9 MPa was evaluated. Cement exposed to a lower salinity brine (1 M) had a larger alteration depth (1.25 mm) compared to cement exposed to a higher salinity brine (2.2 M) (0.836 mm). CO2-O2 exposed cements displayed alteration depths of 1.6 mm at 85 °C and 0.7 mm at 50 °C for 1 M. The cement exposed to the 2.17 M solution had an alteration extending 1.685 mm. The second focus studied the influence of adjacent formations and observed mineral trapping in the Grande Ronde Basalt-cement. Studies of Mt. Simon Sandstone-cement interaction provided evidence for high CO2 storage capacity. The third focus is geochemical modeling using CHIM-XPT. Pure CO2 saturated brines yielded a pH of 3.0 at 1 M and 3.85 at 2.17 M. The CO2-O2 gas run calculated a pH of 3.96 at 1 M and 3.85 at 2.17 M. The Pasco solution after exposure had a pH of 6.97 and an estimated dissolved 161 g of CO2 (g). The pH of the Illinois Basin brine and Mt. Simon sandstone [and cement paste] was 5.8 with an estimated 139 g of CO2 consumed. Lastly, geomechanical tests on CO2 exposed cements indicated that addition of oxygen or changes in temperature play a key role in compressive and tensile strength, decreasing strength by 20-35%. This research highlighted the importance of representing the in-situ wellbore environment when conducting laboratory experiments. This dissertation includes previously published and unpublished co-authored material. Close

• 249. [Article] Lower Snake River Compensation Plan: Oregon Summer Steelhead Evaluation Studies 1999 and 2000 Bi-Annual Progress Report; January 1, 1999 through December 31, 2000

  Abstract -- The purpose of this progress report is to provide summary information for Lower Snake River Compensation Plan (LSRCP) summer steelhead programs operated by ODFW in the Grande Ronde and lmnaha ...

  Citation × Citation Citation Abstract Copy Title: Lower Snake River Compensation Plan: Oregon Summer Steelhead Evaluation Studies 1999 and 2000 Bi-Annual Progress Report; January 1, 1999 through December 31, 2000 Abstract -- The purpose of this progress report is to provide summary information for Lower Snake River Compensation Plan (LSRCP) summer steelhead programs operated by ODFW in the Grande Ronde and lmnaha river basins during 1999 and 2000. These ongoing monitoring programs provide technical, logistical, and biological information to managers charged with maintaining viable salmon and steelhead populations and associated fisheries in Northeast Oregon. This report summarizes fish culture monitoring data for LSRCP facilities for summer steelhead. These data serve as the basis for the analysis of trends in culture performance. Generally speaking, the data in this report were derived from hatchery inventories and standard databases (i.e., PSMFC, Coded-wire tag) or through standard measuring techniques. As such, specific protocols are usually not described. In cases where expansions of data or unique methodologies were used, protocols are described in more detail. Additional descriptions of protocols can be found in the 1999 and 2000 work statements (Carmichael et al. 1999a, Carmichael and Ruzycki 2000). Coded-wire tag (CWT) data that were collected from 1999-2000 adult returns were used to evaluate smolt-to-adult survival rates in experimental rearing and release groups. In 1999-2000, experimental treatments from which fish returned included acclimated vs. direct stream release, forced vs. volitional release, rearing site, growth, and density treatments. In 1999-2000, experimental treatments for which fish were released included forced vs. volitional, and pre-smolt release strategies. Analysis of specific survival studies will be completed once all brood years have returned and CWT data are complete for a given experiment. In addition, much of the data that we discuss in this report will be used in separate and specific evaluations of ongoing supplementation programs for steelhead in the Imnaha River basin. We began culture evaluations in 1983 and have dramatically improved many practices. Progress for work completed in previous years is presented in annual progress reports (Carmichael and Wagner, 1983; Carmichael and Messmer, 1985; Carmichael et al., 1986a, 1987, 1988a, 1988b, 1989, 1990, 1999b, 2004, 2005; Messmer et al., 1989, 1990, 1991, 1992, 1993; Flesher et al., 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999; Whitesel et al., 1993; and Jonasson et al., 1994, 1995, 1996), United States v. Oregon production report (Carmichael et al., 1986b), and a five-year study plan (Carmichael 1989). Progress of related work completed in 1999 and 2000 is presented in summer steelhead creel annual progress reports (Flesher et al., 2000, and 2001), and in the steelhead life history, genetics, and kelt reconditioning 1997-2001 progress report (Ruzycki et al., 2003). This report is organized into fish culture monitoring for juveniles, adults, CWT recoveries, and estimates for total escapement. During the period covered in this report, steelhead from the 1994-1997 broods returned to spawn, steelhead from the 1998 and 1999 broods were released as smolts, and adult steelhead that returned to spawn were used to create the 1999 and 2000 broods. Title: Lower Snake River Compensation Plan: Oregon Summer Steelhead Evaluation Studies 1999 and 2000 Bi-Annual Progress Report; January 1, 1999 through December 31, 2000 Abstract -- The purpose of this progress report is to provide summary information for Lower Snake River Compensation Plan (LSRCP) summer steelhead programs operated by ODFW in the Grande Ronde and lmnaha river basins during 1999 and 2000. These ongoing monitoring programs provide technical, logistical, and biological information to managers charged with maintaining viable salmon and steelhead populations and associated fisheries in Northeast Oregon. This report summarizes fish culture monitoring data for LSRCP facilities for summer steelhead. These data serve as the basis for the analysis of trends in culture performance. Generally speaking, the data in this report were derived from hatchery inventories and standard databases (i.e., PSMFC, Coded-wire tag) or through standard measuring techniques. As such, specific protocols are usually not described. In cases where expansions of data or unique methodologies were used, protocols are described in more detail. Additional descriptions of protocols can be found in the 1999 and 2000 work statements (Carmichael et al. 1999a, Carmichael and Ruzycki 2000). Coded-wire tag (CWT) data that were collected from 1999-2000 adult returns were used to evaluate smolt-to-adult survival rates in experimental rearing and release groups. In 1999-2000, experimental treatments from which fish returned included acclimated vs. direct stream release, forced vs. volitional release, rearing site, growth, and density treatments. In 1999-2000, experimental treatments for which fish were released included forced vs. volitional, and pre-smolt release strategies. Analysis of specific survival studies will be completed once all brood years have returned and CWT data are complete for a given experiment. In addition, much of the data that we discuss in this report will be used in separate and specific evaluations of ongoing supplementation programs for steelhead in the Imnaha River basin. We began culture evaluations in 1983 and have dramatically improved many practices. Progress for work completed in previous years is presented in annual progress reports (Carmichael and Wagner, 1983; Carmichael and Messmer, 1985; Carmichael et al., 1986a, 1987, 1988a, 1988b, 1989, 1990, 1999b, 2004, 2005; Messmer et al., 1989, 1990, 1991, 1992, 1993; Flesher et al., 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999; Whitesel et al., 1993; and Jonasson et al., 1994, 1995, 1996), United States v. Oregon production report (Carmichael et al., 1986b), and a five-year study plan (Carmichael 1989). Progress of related work completed in 1999 and 2000 is presented in summer steelhead creel annual progress reports (Flesher et al., 2000, and 2001), and in the steelhead life history, genetics, and kelt reconditioning 1997-2001 progress report (Ruzycki et al., 2003). This report is organized into fish culture monitoring for juveniles, adults, CWT recoveries, and estimates for total escapement. During the period covered in this report, steelhead from the 1994-1997 broods returned to spawn, steelhead from the 1998 and 1999 broods were released as smolts, and adult steelhead that returned to spawn were used to create the 1999 and 2000 broods. Close

• 250. [Article] Lower Snake River Compensation Plan Oregon Evaluation Studies 1997 and 1998 Bi-Annual Progress Report, January 1, 1997 through December 31, 1998

  Abstract -- The purpose of this progress report is to provide summary information for spring Chinook salmon Lower Snake River Compensation Plan (LSRCP) programs operated by ODFW in the Grande Ronde and ...

  Citation × Citation Citation Abstract Copy Title: Lower Snake River Compensation Plan Oregon Evaluation Studies 1997 and 1998 Bi-Annual Progress Report, January 1, 1997 through December 31, 1998 Abstract -- The purpose of this progress report is to provide summary information for spring Chinook salmon Lower Snake River Compensation Plan (LSRCP) programs operated by ODFW in the Grande Ronde and Imnaha river basins during 1997 and 1998. These ongoing monitoring programs provide technical, logistical and biological information to managers charged with maintaining viable salmon populations and associated fisheries in northeast Oregon. The data in this report serve as the basis for the analysis of trends in culture performance and were derived from hatchery inventories and standard databases (i.e., PSMFC, coded-wire tag) or through standard measuring techniques. As such, specific protocols are usually not described. In cases where expansions of data or unique methodologies were used, protocols are described in more detail. Additional descriptions of protocols can be found in the 1997 and 1998 work statements (Carmichael 1989; Carmichael et al 1997; 1998). Coded-wire tag (CWT) data collected from 1997-1998 adult returns are used to evaluate smolt-to-adult survival rates in experimental rearing and release groups. In 1997-1998, experimental treatments from which salmon returned included acclimated vs. direct stream release, size at release and rearing density. In 1997-1998, experimental treatments for which salmon were released included size at release, presmolt exercise and rearing density treatments. Analysis of specific survival studies will be completed once all brood years have returned and CWT data are complete for a given experiment. In addition, much of the data that we discuss in this report will be used in separate and specific evaluations of ongoing supplementation programs for Chinook salmon in the Imnaha River Basin. We began culture evaluations in 1983 and have dramatically improved many practices. Progress for work completed in previous years is presented in annual progress reports (Carmichael and Wagner 1983; Carmichael and Messmer 1985; Carmichael et al 1986a 1987, 1988a, 1988b, 1989, 1990, 1999 and 2004; Messmer et al 1989, 1990, 1991, 1992 and 1993; Jonasson et al 1994, 1995 and 1996) and United States v. Oregon production report (Carmichael et al 1986b ). Within each section of this report, data are organized into salmon culture monitoring for juveniles, adults, CWT recoveries, compensation goals and estimates for total escapement. During the period covered in this report, Chinook salmon from the 1991-1995 brood years returned to spawn, Chinook salmon from the 1995-1996 brood year were released as smolts and adult Chinook salmon that returned to spawn were used to create the 1997 and 1998 cohorts. Title: Lower Snake River Compensation Plan Oregon Evaluation Studies 1997 and 1998 Bi-Annual Progress Report, January 1, 1997 through December 31, 1998 Abstract -- The purpose of this progress report is to provide summary information for spring Chinook salmon Lower Snake River Compensation Plan (LSRCP) programs operated by ODFW in the Grande Ronde and Imnaha river basins during 1997 and 1998. These ongoing monitoring programs provide technical, logistical and biological information to managers charged with maintaining viable salmon populations and associated fisheries in northeast Oregon. The data in this report serve as the basis for the analysis of trends in culture performance and were derived from hatchery inventories and standard databases (i.e., PSMFC, coded-wire tag) or through standard measuring techniques. As such, specific protocols are usually not described. In cases where expansions of data or unique methodologies were used, protocols are described in more detail. Additional descriptions of protocols can be found in the 1997 and 1998 work statements (Carmichael 1989; Carmichael et al 1997; 1998). Coded-wire tag (CWT) data collected from 1997-1998 adult returns are used to evaluate smolt-to-adult survival rates in experimental rearing and release groups. In 1997-1998, experimental treatments from which salmon returned included acclimated vs. direct stream release, size at release and rearing density. In 1997-1998, experimental treatments for which salmon were released included size at release, presmolt exercise and rearing density treatments. Analysis of specific survival studies will be completed once all brood years have returned and CWT data are complete for a given experiment. In addition, much of the data that we discuss in this report will be used in separate and specific evaluations of ongoing supplementation programs for Chinook salmon in the Imnaha River Basin. We began culture evaluations in 1983 and have dramatically improved many practices. Progress for work completed in previous years is presented in annual progress reports (Carmichael and Wagner 1983; Carmichael and Messmer 1985; Carmichael et al 1986a 1987, 1988a, 1988b, 1989, 1990, 1999 and 2004; Messmer et al 1989, 1990, 1991, 1992 and 1993; Jonasson et al 1994, 1995 and 1996) and United States v. Oregon production report (Carmichael et al 1986b ). Within each section of this report, data are organized into salmon culture monitoring for juveniles, adults, CWT recoveries, compensation goals and estimates for total escapement. During the period covered in this report, Chinook salmon from the 1991-1995 brood years returned to spawn, Chinook salmon from the 1995-1996 brood year were released as smolts and adult Chinook salmon that returned to spawn were used to create the 1997 and 1998 cohorts. Close