Search

Search Results

• 1. [Article] A readership study of Oregon wildlife magazine

  The purpose of this study was to determine the extent and frequency of readership of the Oregon Wildlife magazine and this relationship to Klapper's reinforcing hypothesis. The basic question posed was: ...

  Citation × Citation Citation Abstract Copy Title: A readership study of Oregon wildlife magazine Author: Sullivan, Deborah C. Year: 1978 The purpose of this study was to determine the extent and frequency of readership of the Oregon Wildlife magazine and this relationship to Klapper's reinforcing hypothesis. The basic question posed was: What population of individuals in Oregon read which types of fish and wildlife articles in the Oregon Wildlife magazine, and how do these respondents assess the readability and accuracy of the magazine? Title: A readership study of Oregon wildlife magazine Author: Sullivan, Deborah C. Year: 1978 The purpose of this study was to determine the extent and frequency of readership of the Oregon Wildlife magazine and this relationship to Klapper's reinforcing hypothesis. The basic question posed was: What population of individuals in Oregon read which types of fish and wildlife articles in the Oregon Wildlife magazine, and how do these respondents assess the readability and accuracy of the magazine? Close

• 2. [Article] Wildlife Crossings: Rethinking Road Design to Improve Safety and Reconnect Habitat

  This guidebook provides Portland-area planners with relevant information about wildlife crossings in an urban context. While information on wildlife crossings and their effectiveness has been available ...

  Citation × Citation Citation Abstract Copy Title: Wildlife Crossings: Rethinking Road Design to Improve Safety and Reconnect Habitat Author: Carr, Theresa, Dacanay, Radcliffe, Drake, Kevin, Everson, Charl, Sperry, Arianne, Sullivan, Kerri Year: 2003 This guidebook provides Portland-area planners with relevant information about wildlife crossings in an urban context. While information on wildlife crossings and their effectiveness has been available for a long time, U.S. planners have very little experience with them. In addition, existing information is geared towards rural applications and is not easily transferred to urban environments. It is important to organize this information in a way that is useful to local planners for a number of reasons. First, users should be familiar with the range of available options. Second, there are a number of federal funding alternatives that could be used for wildlife crossings. Finally, there is a need to integrate better wildlife habitat mitigation measures into urban roadway projects. This book is designed to answer five basic questions that might face a planner or community member considering a crossing to mitigate the impact of roads on wildlife: What types of wildlife impacts do roads create, and how will a wildlife crossing help mitigate them? What should be the goals of a wildlife crossing project, and how should the success of a crossing project be measured? Where should wildlife crossings be located? What design options are appropriate for a given location and road project? What policy issues might affect a wildlife crossing project? This project was conducted under the supervision of Deborah Howe, Steve Johnson, and Connie Ozawa. Title: Wildlife Crossings: Rethinking Road Design to Improve Safety and Reconnect Habitat Author: Carr, Theresa, Dacanay, Radcliffe, Drake, Kevin, Everson, Charl, Sperry, Arianne, Sullivan, Kerri Year: 2003 This guidebook provides Portland-area planners with relevant information about wildlife crossings in an urban context. While information on wildlife crossings and their effectiveness has been available for a long time, U.S. planners have very little experience with them. In addition, existing information is geared towards rural applications and is not easily transferred to urban environments. It is important to organize this information in a way that is useful to local planners for a number of reasons. First, users should be familiar with the range of available options. Second, there are a number of federal funding alternatives that could be used for wildlife crossings. Finally, there is a need to integrate better wildlife habitat mitigation measures into urban roadway projects. This book is designed to answer five basic questions that might face a planner or community member considering a crossing to mitigate the impact of roads on wildlife: What types of wildlife impacts do roads create, and how will a wildlife crossing help mitigate them? What should be the goals of a wildlife crossing project, and how should the success of a crossing project be measured? Where should wildlife crossings be located? What design options are appropriate for a given location and road project? What policy issues might affect a wildlife crossing project? This project was conducted under the supervision of Deborah Howe, Steve Johnson, and Connie Ozawa. Close

• 3. [Article] Influence of Wetland Landscape Structure on Duck Nest Success at Malheur National Wildlife Refuge, Oregon

  The decline of waterfowl populations and their requisite wetland habitats remains a concern. Because migratory bird refuges are often artificial landscapes of actively managed wetlands, and wildlife populations ...

  Citation × Citation Citation Abstract Copy Title: Influence of Wetland Landscape Structure on Duck Nest Success at Malheur National Wildlife Refuge, Oregon Author: Craver, Daniel Robert Year: 2010 The decline of waterfowl populations and their requisite wetland habitats remains a concern. Because migratory bird refuges are often artificial landscapes of actively managed wetlands, and wildlife populations experience their greatest change during the breeding season, refuges should be designed to maximize breeding habitat. While past nest success studies have focused on at-nest variables, new approaches are needed to evaluate the effect of composition and configuration of plant communities at the landscape scale. This study aims to quantify landscape patterns within individual refuge management units to determine influence upon historical nesting success averages of ducks at Malheur National Wildlife Refuge in southeastern Oregon. The Mayfield estimate of nest success for 8 duck species yields a survival rate of 25% for the years 1987-1998 with a range of 0-74% across 48 management units. FRAGSTATS was used to calculate a suite of 9 landscape pattern metrics per unit at the class-level for each of 3 wetland habitat classes, and at the landscape-level using all habitat types. These 36 variables were tested for association with survival rate using Pearson R correlation. Results suggest fragmentation of dry meadow habitat; patch size, complexity, and extensiveness of wet meadow habitat; and diversity of habitats across the landscape positively influence duck nest success at the scale of the individual management unit. Title: Influence of Wetland Landscape Structure on Duck Nest Success at Malheur National Wildlife Refuge, Oregon Author: Craver, Daniel Robert Year: 2010 The decline of waterfowl populations and their requisite wetland habitats remains a concern. Because migratory bird refuges are often artificial landscapes of actively managed wetlands, and wildlife populations experience their greatest change during the breeding season, refuges should be designed to maximize breeding habitat. While past nest success studies have focused on at-nest variables, new approaches are needed to evaluate the effect of composition and configuration of plant communities at the landscape scale. This study aims to quantify landscape patterns within individual refuge management units to determine influence upon historical nesting success averages of ducks at Malheur National Wildlife Refuge in southeastern Oregon. The Mayfield estimate of nest success for 8 duck species yields a survival rate of 25% for the years 1987-1998 with a range of 0-74% across 48 management units. FRAGSTATS was used to calculate a suite of 9 landscape pattern metrics per unit at the class-level for each of 3 wetland habitat classes, and at the landscape-level using all habitat types. These 36 variables were tested for association with survival rate using Pearson R correlation. Results suggest fragmentation of dry meadow habitat; patch size, complexity, and extensiveness of wet meadow habitat; and diversity of habitats across the landscape positively influence duck nest success at the scale of the individual management unit. Close

• 4. [Article] A Comparison Between Sources of Student Anti-Hunting Sentiment and Wildlife Information Sources of a Sample of Oregon Adults

  This study investigated the various sources of information utilized by a sample of the Oregon adult population to gain information and ideas about the wildlife resource. The results were compared to those ...

  Citation × Citation Citation Abstract Copy Title: A Comparison Between Sources of Student Anti-Hunting Sentiment and Wildlife Information Sources of a Sample of Oregon Adults Author: Shay, Ron E. Year: 1974 This study investigated the various sources of information utilized by a sample of the Oregon adult population to gain information and ideas about the wildlife resource. The results were compared to those of a study of college and university students and their sources of information that gave them anti-hunting attitudes. The basic question posed was: What sources of information are most commonly utilized by a sample of Oregon’s population in obtaining ideas and information concerning the wildlife resource and do the proportions of various sources utilized compare with those indicated by college students as sources of anti-hunting sentiments? Additional questions asked of the subjects revealed less anti-hunting sentiment than in many portions of the United States and further hinted at simple bias in the direction of pro-hunting attitudes. Title: A Comparison Between Sources of Student Anti-Hunting Sentiment and Wildlife Information Sources of a Sample of Oregon Adults Author: Shay, Ron E. Year: 1974 This study investigated the various sources of information utilized by a sample of the Oregon adult population to gain information and ideas about the wildlife resource. The results were compared to those of a study of college and university students and their sources of information that gave them anti-hunting attitudes. The basic question posed was: What sources of information are most commonly utilized by a sample of Oregon’s population in obtaining ideas and information concerning the wildlife resource and do the proportions of various sources utilized compare with those indicated by college students as sources of anti-hunting sentiments? Additional questions asked of the subjects revealed less anti-hunting sentiment than in many portions of the United States and further hinted at simple bias in the direction of pro-hunting attitudes. Close

• 5. [Article] The Landscape: Sauvie Island

  A brief overview of the geography, history and outlook for Sauvie Island, an area situated at the confluence of the Willamette and Columbia Rivers that is important as a wildlife refuge, farming areas, ...

  Citation × Citation Citation Abstract Copy Title: The Landscape: Sauvie Island Author: Roth, Rick Year: 2001 A brief overview of the geography, history and outlook for Sauvie Island, an area situated at the confluence of the Willamette and Columbia Rivers that is important as a wildlife refuge, farming areas, and for recreation. Title: The Landscape: Sauvie Island Author: Roth, Rick Year: 2001 A brief overview of the geography, history and outlook for Sauvie Island, an area situated at the confluence of the Willamette and Columbia Rivers that is important as a wildlife refuge, farming areas, and for recreation. Close

• 6. [Article] An Experimental Investigation of Nest Reuse and Nest Site Selection in an Open-Cup Nesting Passerine

  Eastern Kingbirds (Tyrannus tyrannus) breed from coast to coast in North America and build open-cup nests in trees. They have been extensively studied across most of their range and have only on occasion ...

  Citation × Citation Citation Abstract Copy Title: An Experimental Investigation of Nest Reuse and Nest Site Selection in an Open-Cup Nesting Passerine Author: Cancellieri, Sarah A. Year: 2013 Eastern Kingbirds (Tyrannus tyrannus) breed from coast to coast in North America and build open-cup nests in trees. They have been extensively studied across most of their range and have only on occasion been documented to reuse a nest from a previous season. However, at Malheur National Wildlife Refuge (MNWR), located in southeastern Oregon, ~10 % of female Eastern Kingbirds reuse old nests of mainly American Robins (Turdus migratorius). In an attempt to address why nest reuse is so common at MNWR, I used artificial nests to evaluate two hypotheses as to why nest reuse is common in this breeding population. The first hypothesis states that Eastern Kingbirds reuse nests to save time and/or energy (TES) and the second one states nest reuse occurs because there is a shortage of suitable nest sites (NSS). I was able to reject the TES hypothesis because artificial nests provided no apparent reproductive benefits to Eastern Kingbirds, except that if a nest had failed it took less time to lay a replacement clutch after an initial failure if an artificial nest was used instead of building a new nest. A more reasonable explanation is that Eastern Kingbirds face a limited availability of suitable nest sites. With this in mind, I took vegetation measurements to address the hypothesis that Eastern Kingbirds make adaptive choices when selecting a nest site, in which case they would choose sites that increase their probability of breeding successfully. Successful nests, both natural and artificial, were placed higher in a tree and on a steeper angled nest branch than their failed counterparts. Those findings suggest that Eastern Kingbirds make adaptive choices when selecting a nest site. Title: An Experimental Investigation of Nest Reuse and Nest Site Selection in an Open-Cup Nesting Passerine Author: Cancellieri, Sarah A. Year: 2013 Eastern Kingbirds (Tyrannus tyrannus) breed from coast to coast in North America and build open-cup nests in trees. They have been extensively studied across most of their range and have only on occasion been documented to reuse a nest from a previous season. However, at Malheur National Wildlife Refuge (MNWR), located in southeastern Oregon, ~10 % of female Eastern Kingbirds reuse old nests of mainly American Robins (Turdus migratorius). In an attempt to address why nest reuse is so common at MNWR, I used artificial nests to evaluate two hypotheses as to why nest reuse is common in this breeding population. The first hypothesis states that Eastern Kingbirds reuse nests to save time and/or energy (TES) and the second one states nest reuse occurs because there is a shortage of suitable nest sites (NSS). I was able to reject the TES hypothesis because artificial nests provided no apparent reproductive benefits to Eastern Kingbirds, except that if a nest had failed it took less time to lay a replacement clutch after an initial failure if an artificial nest was used instead of building a new nest. A more reasonable explanation is that Eastern Kingbirds face a limited availability of suitable nest sites. With this in mind, I took vegetation measurements to address the hypothesis that Eastern Kingbirds make adaptive choices when selecting a nest site, in which case they would choose sites that increase their probability of breeding successfully. Successful nests, both natural and artificial, were placed higher in a tree and on a steeper angled nest branch than their failed counterparts. Those findings suggest that Eastern Kingbirds make adaptive choices when selecting a nest site. Close

• 7. [Article] A Behavior-Based Framework for Assessing Barrier Effects to Wildlife from Vehicle Traffic Volume

  Roads, while central to the function of human society, create barriers to animal movement through collisions and habitat fragmentation. Barriers to animal movement affect the evolution and trajectory of ...

  Citation × Citation Citation Abstract Copy Title: A Behavior-Based Framework for Assessing Barrier Effects to Wildlife from Vehicle Traffic Volume Author: Jacobson, Sandra L., Bliss-Ketchum, Leslie L., de Rivera, Catherine E., Smith, Winston P. Year: 2016 Roads, while central to the function of human society, create barriers to animal movement through collisions and habitat fragmentation. Barriers to animal movement affect the evolution and trajectory of populations. Investigators have attempted to use traffic volume, the number of vehicles passing a point on a road segment, to predict effects to wildlife populations approximately linearly and along taxonomic lines; however, taxonomic groupings cannot provide sound predictions because closely related species often respond differently. We assess the role of wildlife behavioral responses to traffic volume as a tool to predict barrier effects from vehicle-caused mortality and avoidance, to provide an early warning system that recognizes traffic volume as a trigger for mitigation, and to better interpret roadkill data. We propose four categories of behavioral response based on the perceived danger to traffic: Nonresponders, Pausers, Speeders, and Avoiders. Nonresponders attempt to cross highways regardless of traffic volume. Pausers stop in the face of danger so have a low probability of successful crossing when traffic volume increases. Hence, highway barrier effects are primarily due to mortality for Nonresponders and Pausers at high traffic volumes. Speeders run away from danger but are unable to do so successfully as traffic volume increases. At moderate to high volume, Speeders are repelled by traffic danger. Avoiders face lower mortality than other categories because they begin to avoid traffic at relatively low traffic volumes. Hence, avoidance causes barrier effects more than mortality for Speeders and Avoiders even at relatively moderate traffic volumes. By considering a species’ risk-avoidance response to traffic, managers can make more appropriate and timely decisions to mitigate effects before populations decline or become locally extinct. Title: A Behavior-Based Framework for Assessing Barrier Effects to Wildlife from Vehicle Traffic Volume Author: Jacobson, Sandra L., Bliss-Ketchum, Leslie L., de Rivera, Catherine E., Smith, Winston P. Year: 2016 Roads, while central to the function of human society, create barriers to animal movement through collisions and habitat fragmentation. Barriers to animal movement affect the evolution and trajectory of populations. Investigators have attempted to use traffic volume, the number of vehicles passing a point on a road segment, to predict effects to wildlife populations approximately linearly and along taxonomic lines; however, taxonomic groupings cannot provide sound predictions because closely related species often respond differently. We assess the role of wildlife behavioral responses to traffic volume as a tool to predict barrier effects from vehicle-caused mortality and avoidance, to provide an early warning system that recognizes traffic volume as a trigger for mitigation, and to better interpret roadkill data. We propose four categories of behavioral response based on the perceived danger to traffic: Nonresponders, Pausers, Speeders, and Avoiders. Nonresponders attempt to cross highways regardless of traffic volume. Pausers stop in the face of danger so have a low probability of successful crossing when traffic volume increases. Hence, highway barrier effects are primarily due to mortality for Nonresponders and Pausers at high traffic volumes. Speeders run away from danger but are unable to do so successfully as traffic volume increases. At moderate to high volume, Speeders are repelled by traffic danger. Avoiders face lower mortality than other categories because they begin to avoid traffic at relatively low traffic volumes. Hence, avoidance causes barrier effects more than mortality for Speeders and Avoiders even at relatively moderate traffic volumes. By considering a species’ risk-avoidance response to traffic, managers can make more appropriate and timely decisions to mitigate effects before populations decline or become locally extinct. Close

• 8. [Article] Wet Meadow Plant Associations, Malheur National Wildlife Refuge, Harney County, Oregon

  In July 2012, we sampled 131 plots in wet meadow habitat at the southern end of the Malheur National Wildlife Refuge. Analysis of the data identified eleven different plant associations: Alopecurus pratensis, ...

  Citation × Citation Citation Abstract Copy Title: Wet Meadow Plant Associations, Malheur National Wildlife Refuge, Harney County, Oregon Author: Christy, John A. Year: 2013 In July 2012, we sampled 131 plots in wet meadow habitat at the southern end of the Malheur National Wildlife Refuge. Analysis of the data identified eleven different plant associations: Alopecurus pratensis, Carex aquatilis var. aquatilis, Carex nebrascensis, Carex pellita, Carex praegracilis, Carex sheldonii, Distichlis spicata, Juncus balticus, Leymus triticoides, Phalaris arundinacea, and Sparganium eurycarpum. Plant associations spanned a wetland gradient from seasonally moist to seasonally or perennially flooded, but surface water had left most stands at time of sampling. Mean Wetland Indicator Status scores help to place the plant associations within gradients in soil moisture and alkalinity. The Alopecurus pratensis and Phalaris arundinacea associations are dominated by exotic, invasive species and appear to be outcompeting native plant associations. Phases of the Carex praegracilis association appear to be replaced by the Alopecurus pratensis association, while the Carex pellita, Juncus balticus, and Leymus triticoides associations may be replaced by the Phalaris arundinacea association. The Carex aquatilis and Sparganium eurycarpum associations were undersampled and provide only an estimate of composition. Most associations are consistent with what has been included in the National Vegetation Classification. Title: Wet Meadow Plant Associations, Malheur National Wildlife Refuge, Harney County, Oregon Author: Christy, John A. Year: 2013 In July 2012, we sampled 131 plots in wet meadow habitat at the southern end of the Malheur National Wildlife Refuge. Analysis of the data identified eleven different plant associations: Alopecurus pratensis, Carex aquatilis var. aquatilis, Carex nebrascensis, Carex pellita, Carex praegracilis, Carex sheldonii, Distichlis spicata, Juncus balticus, Leymus triticoides, Phalaris arundinacea, and Sparganium eurycarpum. Plant associations spanned a wetland gradient from seasonally moist to seasonally or perennially flooded, but surface water had left most stands at time of sampling. Mean Wetland Indicator Status scores help to place the plant associations within gradients in soil moisture and alkalinity. The Alopecurus pratensis and Phalaris arundinacea associations are dominated by exotic, invasive species and appear to be outcompeting native plant associations. Phases of the Carex praegracilis association appear to be replaced by the Alopecurus pratensis association, while the Carex pellita, Juncus balticus, and Leymus triticoides associations may be replaced by the Phalaris arundinacea association. The Carex aquatilis and Sparganium eurycarpum associations were undersampled and provide only an estimate of composition. Most associations are consistent with what has been included in the National Vegetation Classification. Close

• 9. [Article] Wet Meadow Plant Associations, Double O Unit, Malheur National Wildlife Refuge, Harney County, Oregon

  This report summarizes vegetation data collected in July 2015 in wet meadow and marshy habitats on the Double O Unit of Malheur National Wildlife Refuge (MNWR). Because vegetation sampled at the Double ...

  Citation × Citation Citation Abstract Copy Title: Wet Meadow Plant Associations, Double O Unit, Malheur National Wildlife Refuge, Harney County, Oregon Author: Christy, John A. Year: 2016 This report summarizes vegetation data collected in July 2015 in wet meadow and marshy habitats on the Double O Unit of Malheur National Wildlife Refuge (MNWR). Because vegetation sampled at the Double O was wetter and more alkaline than wet meadows sampled at the south end of the refuge in 2012 and 2013 (Christy 2014), data from the Double O Unit were analyzed and summarized separately. A total of 83 plots were sampled in 2015, and analysis of the data identified 14 plant associations: Alopecurus aequalis - Juncus balticus, Alopecurus pratensis - Potentilla anserina, Carex praegracilis - Juncus balticus, Cicuta douglasii - Carex nebrascensis, Distichlis spicata - Amphiscirpus nevadensis, Distichlis spicata - Nitrophila occidentalis, Eleocharis palustris - Juncus balticus, Eleocharis rostellata, Juncus balticus - Glaux maritima, Hippuris vulgaris - Triglochin maritima, Leymus triticoides - Juncus balticus, Schoenoplectus americanus, Spartina gracilis, and Triglochin maritima. Plant associations spanned a wetland gradient from seasonally moist to seasonally or perennially flooded, but surface water had left most stands at time of sampling. Mean Wetland Indicator Status scores and species composition help to place the plant associations within gradients in soil moisture and alkalinity. Seven of the 14 plant associations are listed in the International Vegetation Classification, and the remaining types are provisional Title: Wet Meadow Plant Associations, Double O Unit, Malheur National Wildlife Refuge, Harney County, Oregon Author: Christy, John A. Year: 2016 This report summarizes vegetation data collected in July 2015 in wet meadow and marshy habitats on the Double O Unit of Malheur National Wildlife Refuge (MNWR). Because vegetation sampled at the Double O was wetter and more alkaline than wet meadows sampled at the south end of the refuge in 2012 and 2013 (Christy 2014), data from the Double O Unit were analyzed and summarized separately. A total of 83 plots were sampled in 2015, and analysis of the data identified 14 plant associations: Alopecurus aequalis - Juncus balticus, Alopecurus pratensis - Potentilla anserina, Carex praegracilis - Juncus balticus, Cicuta douglasii - Carex nebrascensis, Distichlis spicata - Amphiscirpus nevadensis, Distichlis spicata - Nitrophila occidentalis, Eleocharis palustris - Juncus balticus, Eleocharis rostellata, Juncus balticus - Glaux maritima, Hippuris vulgaris - Triglochin maritima, Leymus triticoides - Juncus balticus, Schoenoplectus americanus, Spartina gracilis, and Triglochin maritima. Plant associations spanned a wetland gradient from seasonally moist to seasonally or perennially flooded, but surface water had left most stands at time of sampling. Mean Wetland Indicator Status scores and species composition help to place the plant associations within gradients in soil moisture and alkalinity. Seven of the 14 plant associations are listed in the International Vegetation Classification, and the remaining types are provisional Close

• 10. [Article] Archaeological Investigations at 45CL1 Cathlapotle (1991-1996) , Ridgefield National Wildlife Refuge Clark County, Washington A Preliminary Report

  Archaeological investigations at site 45CL1, Clark County, Washington, demonstrate that the locality is a very large (c 1.5ha), deeply stratified (2-4m) town site with an occupation spanning at least 1000 ...

  Citation × Citation Citation Abstract Copy Title: Archaeological Investigations at 45CL1 Cathlapotle (1991-1996) , Ridgefield National Wildlife Refuge Clark County, Washington A Preliminary Report Author: Ames, Kenneth M., Smith, Cameron M., Cornett, William L., Sobel, Elizabeth A., Hamilton, Stephen C., Wolf, John, Raetz, Doria, U.S. Fish and Wildlife Service. Region 1, Portland State University. Department of Anthropology Year: 1999 Archaeological investigations at site 45CL1, Clark County, Washington, demonstrate that the locality is a very large (c 1.5ha), deeply stratified (2-4m) town site with an occupation spanning at least 1000 years (c. AD 1000 to 1840). Six large, complex depressions have been mapped. Test excavations show that these depressions represent the semisubterranean portions of residential structures, probably large plankhouses of the type common on the Lower Columbia River and the Northwest Coast in aboriginal times. The depressions may represent as many as 11 such dwellings. A seventh depression is deeply buried beneath midden deposits. The cultural deposits contain very high densities of artifacts, ecofacts (including both faunal and floral remains), debris and features. The site is near the Columbia River on a very active flood plain, resulting in site stratigraphy produced by a combination of active cultural and alluvial depositional processes. Site 45CL1, given its location and size, is the best candidate to be the site of Cathlapotle, a Middle Chinookan town visited by Lewis and Clark in 1806, as well as by other early Europeans in the area. The site is extraordinarily well preserved, having undergone only minor alterations since its abandonment, probably in the third or fourth decade of the 19th century AD. Title: Archaeological Investigations at 45CL1 Cathlapotle (1991-1996) , Ridgefield National Wildlife Refuge Clark County, Washington A Preliminary Report Author: Ames, Kenneth M., Smith, Cameron M., Cornett, William L., Sobel, Elizabeth A., Hamilton, Stephen C., Wolf, John, Raetz, Doria, U.S. Fish and Wildlife Service. Region 1, Portland State University. Department of Anthropology Year: 1999 Archaeological investigations at site 45CL1, Clark County, Washington, demonstrate that the locality is a very large (c 1.5ha), deeply stratified (2-4m) town site with an occupation spanning at least 1000 years (c. AD 1000 to 1840). Six large, complex depressions have been mapped. Test excavations show that these depressions represent the semisubterranean portions of residential structures, probably large plankhouses of the type common on the Lower Columbia River and the Northwest Coast in aboriginal times. The depressions may represent as many as 11 such dwellings. A seventh depression is deeply buried beneath midden deposits. The cultural deposits contain very high densities of artifacts, ecofacts (including both faunal and floral remains), debris and features. The site is near the Columbia River on a very active flood plain, resulting in site stratigraphy produced by a combination of active cultural and alluvial depositional processes. Site 45CL1, given its location and size, is the best candidate to be the site of Cathlapotle, a Middle Chinookan town visited by Lewis and Clark in 1806, as well as by other early Europeans in the area. The site is extraordinarily well preserved, having undergone only minor alterations since its abandonment, probably in the third or fourth decade of the 19th century AD. Close