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• 1. [Article] Harney-Malheur Lakes Subbasin Assessment

  Abstract -- Harney-Malheur Lakes Subbasin Assessment was completed by the Harney County Watershed Council. The Harney-Malheur Lakes Subbasin is 894,061 acres in Harney County, Oregon. The document discusses ...

  Citation × Citation Citation Abstract Copy Title: Harney-Malheur Lakes Subbasin Assessment Abstract -- Harney-Malheur Lakes Subbasin Assessment was completed by the Harney County Watershed Council. The Harney-Malheur Lakes Subbasin is 894,061 acres in Harney County, Oregon. The document discusses the history of the Harney-Malheur Lakes Subbasin including the environmental factors associated withthe subbasin (climate, geology, hydrology, ground and surface water and water supply. Fish and wildlife, habitat and vegetation types are discussed to understand the main inhabitants and how best to manage those populations found in the subbasin. The last section of the document discusses current issues within the subbasin and the reccomendations to deal with those issues. Title: Harney-Malheur Lakes Subbasin Assessment Abstract -- Harney-Malheur Lakes Subbasin Assessment was completed by the Harney County Watershed Council. The Harney-Malheur Lakes Subbasin is 894,061 acres in Harney County, Oregon. The document discusses the history of the Harney-Malheur Lakes Subbasin including the environmental factors associated withthe subbasin (climate, geology, hydrology, ground and surface water and water supply. Fish and wildlife, habitat and vegetation types are discussed to understand the main inhabitants and how best to manage those populations found in the subbasin. The last section of the document discusses current issues within the subbasin and the reccomendations to deal with those issues. Close

• 2. [Article] Gilliam, Morrow and Umatilla County Master Plan for Angler Access and Associated Recreational Uses 1967

  Abstract -- All three counties, Gilliam, Morrow, and Umatilla, are located in the northeastern quarter of the state and encompass an area of 6,524 square miles. The climate of this region is temperate ...

  Citation × Citation Citation Abstract Copy Title: Gilliam, Morrow and Umatilla County Master Plan for Angler Access and Associated Recreational Uses 1967 Abstract -- All three counties, Gilliam, Morrow, and Umatilla, are located in the northeastern quarter of the state and encompass an area of 6,524 square miles. The climate of this region is temperate and semiarid, characterized by low annual precipitation, low winter temperatures, and high summer temperatures. The fishery consists of warm-water game fish and trout. McKay and Cold Springs Reservoirs provide both types of fisheries while the remainder of the impoundments provide angling on stocked rainbow trout. The season is open the entire year on these waters with the exception of McKay and Cold Springs Reservoirs which are closed during the waterfowl nesting period. Since this area has only a limited supply of surface water, emphasis is being put on the construction of reservoirs which would impound runoff waters for angling and other recreation uses. At present, there are only six impoundments within the tri-county area. and these come far from meeting the public demand. An additional 15 reservoirs have been recommended for future development in order to provide adequate public fishing access. Title: Gilliam, Morrow and Umatilla County Master Plan for Angler Access and Associated Recreational Uses 1967 Abstract -- All three counties, Gilliam, Morrow, and Umatilla, are located in the northeastern quarter of the state and encompass an area of 6,524 square miles. The climate of this region is temperate and semiarid, characterized by low annual precipitation, low winter temperatures, and high summer temperatures. The fishery consists of warm-water game fish and trout. McKay and Cold Springs Reservoirs provide both types of fisheries while the remainder of the impoundments provide angling on stocked rainbow trout. The season is open the entire year on these waters with the exception of McKay and Cold Springs Reservoirs which are closed during the waterfowl nesting period. Since this area has only a limited supply of surface water, emphasis is being put on the construction of reservoirs which would impound runoff waters for angling and other recreation uses. At present, there are only six impoundments within the tri-county area. and these come far from meeting the public demand. An additional 15 reservoirs have been recommended for future development in order to provide adequate public fishing access. Close

• 3. [Article] Surface-Ground Water Interactions Along Oregon's Lower Walla Walla River 2000 - 2001

  Abstract -- This report describes surface - groundwater interactions in the Walla Walla River between the WA-OR border and the town of Milton-Freewater. It includes detailed sections on seepage, vertical ...

  Citation × Citation Citation Abstract Copy Title: Surface-Ground Water Interactions Along Oregon's Lower Walla Walla River 2000 - 2001 Abstract -- This report describes surface - groundwater interactions in the Walla Walla River between the WA-OR border and the town of Milton-Freewater. It includes detailed sections on seepage, vertical and horizontal hydraulic gradients, and chemical signatures. It also provides geologic and watertable mapping, conclusions, and recommendations. Title: Surface-Ground Water Interactions Along Oregon's Lower Walla Walla River 2000 - 2001 Abstract -- This report describes surface - groundwater interactions in the Walla Walla River between the WA-OR border and the town of Milton-Freewater. It includes detailed sections on seepage, vertical and horizontal hydraulic gradients, and chemical signatures. It also provides geologic and watertable mapping, conclusions, and recommendations. Close

• 4. [Article] 2009 Borax Lake Chub Investigations Progress Reports 2009

  Abstract -- The Borax Lake chub (Gila boraxobius) is a small minnow endemic to Borax Lake and adjacent wetlands in the Alvord Basin in Harney County, Oregon (Williams and Bond 1980). Borax Lake chub are ...

  Citation × Citation Citation Abstract Copy Title: 2009 Borax Lake Chub Investigations Progress Reports 2009 Abstract -- The Borax Lake chub (Gila boraxobius) is a small minnow endemic to Borax Lake and adjacent wetlands in the Alvord Basin in Harney County, Oregon (Williams and Bond 1980). Borax Lake chub are represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake. Borax Lake is a natural lake perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained since 1991 indicate a fluctuating population ranging between approximately 4,000 and 34,000 fish (Salzer 1997; Scheerer and Jacobs 2008). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65-hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat, have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). A review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at that time. Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub and 2) to evaluate habitat conditions at Borax Lake, including the condition of the fragile lake shoreline and outflows. This report describes results from monitoring conducted by Oregon Department of Fish and Wildlife’s Native Fish Investigations Project in 2009. Title: 2009 Borax Lake Chub Investigations Progress Reports 2009 Abstract -- The Borax Lake chub (Gila boraxobius) is a small minnow endemic to Borax Lake and adjacent wetlands in the Alvord Basin in Harney County, Oregon (Williams and Bond 1980). Borax Lake chub are represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake. Borax Lake is a natural lake perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained since 1991 indicate a fluctuating population ranging between approximately 4,000 and 34,000 fish (Salzer 1997; Scheerer and Jacobs 2008). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65-hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat, have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). A review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at that time. Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub and 2) to evaluate habitat conditions at Borax Lake, including the condition of the fragile lake shoreline and outflows. This report describes results from monitoring conducted by Oregon Department of Fish and Wildlife’s Native Fish Investigations Project in 2009. Close

• 5. [Article] 2006 Borax Lake Chub Investigations Progress Reports 2006

  Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small ...

  Citation × Citation Citation Abstract Copy Title: 2006 Borax Lake Chub Investigations Progress Reports 2006 Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small minnow endemic to Borax Lake and adjacent wetlands in Oregon’s Alvord Basin (Williams and Bond 1980). Borax Lake is a natural lake, perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained in 1991-1996 indicated a fluctuating population ranging from a low of 8,144 fish to a high of 34,634 fish (Salzer 1997). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Numerous recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65- hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. From 1998-2004, data describing the abundance of the Borax Lake chub population are not available. Abundance estimates were obtained from 1986- 1997 by The Nature Conservancy (Salzer 1997) (Figure 1). Abundance estimates for 1986-1990 are not comparable with those obtained in 1991-1997. Prior to 1991, estimates were obtained only from traps set around the perimeter of the lake. In 1991, estimates were obtained from traps set on a regularly spaced grid throughout the lake. A study comparing the methods suggests that prior to 1991 abundance was under estimated, perhaps by as much as 50 percent (Salzer 1992). A recent review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at this time. The chub population has experienced substantial fluctuations in abundance over the time period (1986-1997) when abundance data are available (Figure 1). At the time of the review, the most recent abundance estimates that were obtained in 1996 and 1997 were some of the lowest estimates since 1991. Borax Lake chub population abundance estimates from 1986 to 1997 and 2005 to 2006. Horizontal bars represent 95% confidence limits. In 1986-1990 (solid symbols), only the perimeter of the lake was trapped. After 1990 (open symbols) the entire lake was trapped. Estimates are not directly comparable across these time periods. There are limited data on population age structure that offer valuable insight into the productivity of Borax Lake chub. Williams and Bond (1983) examined lengthfrequency data and concluded that the population consisted primarily of age 1 fish, with few age 2 and age 3 fish present. Limited opercle bone aging of chub collected in 1992- 1993 also indicated that most Borax Lake were less than one year of age (67-79%), yet a few individuals were aged at 10+ years (Scoppettone 1995). Because Borax Lake chub are only found in one location and the population is apparently dominated by a single year-class of adults, the species has a high inherent risk of extinction. 3 The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub, and 2) to evaluate ways to reduce handling of Borax Lake chub when monitoring population abundance both by modifying previous mark-recapture protocols and by developing snorkeling survey protocols to use as an alternative to mark-recapture estimates. In addition, we collected data regarding lake temperatures, chub size (age) structure, and the condition of the fragile lake shoreline and outflows. Title: 2006 Borax Lake Chub Investigations Progress Reports 2006 Abstract -- Borax Lake chub (Gila boraxobius) is represented by a single population that inhabits a 4.1 hectare geothermally-heated alkaline lake in Harney County, Oregon. The Borax Lake chub is a small minnow endemic to Borax Lake and adjacent wetlands in Oregon’s Alvord Basin (Williams and Bond 1980). Borax Lake is a natural lake, perched 10 meters above the desert floor on sinter deposits, which is fed almost exclusively by thermal groundwater. The Borax Lake chub was listed as endangered under the federal Endangered Species Act in 1982 (U.S. Fish and Wildlife Service 1982). Population abundance estimates obtained in 1991-1996 indicated a fluctuating population ranging from a low of 8,144 fish to a high of 34,634 fish (Salzer 1997). The basis for the Borax Lake chub’s listed status was not population size, but the security of a very limited, unique, isolated, and vulnerable habitat. Because Borax Lake is situated above salt deposits on the desert floor, alteration of the salt crust shoreline could reduce lake levels and the habitat quantity and quality available to Borax Lake chub. At the time of the listing, Borax Lake was threatened by habitat alteration caused by geothermal energy development and alteration of the lake shore crust to provide irrigation to surrounding pasture lands. The Borax Lake chub federal recovery plan, completed in 1987, advocated protection of the lake ecosystem through the acquisition of key private lands, protection of groundwater and surface waters, controls on access, and the removal of livestock grazing (U.S. Fish and Wildlife Service 1987). Numerous recovery measures implemented since listing have improved the conservation status of Borax Lake chub and protection of its habitat (Williams and Macdonald 2003). When the species was listed, critical habitat was designated on 259 hectares of land surrounding the lake, including 129 hectares of public lands and two 65- hectare parcels of private land. In 1983, the U.S. Bureau of Land Management designated the public land as an Area of Critical Environmental Concern. The Nature Conservancy began leasing the private lands in 1983 and purchased them in 1993, bringing the entire critical habitat into public or conservation ownership. The Nature Conservancy ended water diversion from the lake for irrigation and livestock grazing within the critical habitat. Passage of the Steens Mountain Cooperative Management and Protection Act of 2000 removed the public BLM lands from mineral and geothermal development within a majority of the basin. These actions, combined with detailed studies of the chub and their habitat have added substantially to our knowledge of the Borax Lake ecosystem (Scoppettone et al. 1995, Salzer 1992, Perkins et al. 1996). However, three primary threats remain. These include the threat to the fragile lake shoreline, wetlands, and soils from a recent increase in recreational use around the lake (particularly off-road vehicle usage), the threat of introduction of nonnative species, and potential negative impacts to the aquifer from geothermal groundwater withdrawal if groundwater pumping were to occur on private lands outside the protected areas (Williams and Macdonald 2003). Although an increase in abundance is not a goal in the successful recovery of this species, monitoring trends in abundance over time is an important management tool to assess species status. From 1998-2004, data describing the abundance of the Borax Lake chub population are not available. Abundance estimates were obtained from 1986- 1997 by The Nature Conservancy (Salzer 1997) (Figure 1). Abundance estimates for 1986-1990 are not comparable with those obtained in 1991-1997. Prior to 1991, estimates were obtained only from traps set around the perimeter of the lake. In 1991, estimates were obtained from traps set on a regularly spaced grid throughout the lake. A study comparing the methods suggests that prior to 1991 abundance was under estimated, perhaps by as much as 50 percent (Salzer 1992). A recent review of the conservation status of the Borax Lake chub by Williams and Macdonald (2003) cited the lack of recent and ongoing population and ecosystem monitoring as one argument against downlisting or delisting the species at this time. The chub population has experienced substantial fluctuations in abundance over the time period (1986-1997) when abundance data are available (Figure 1). At the time of the review, the most recent abundance estimates that were obtained in 1996 and 1997 were some of the lowest estimates since 1991. Borax Lake chub population abundance estimates from 1986 to 1997 and 2005 to 2006. Horizontal bars represent 95% confidence limits. In 1986-1990 (solid symbols), only the perimeter of the lake was trapped. After 1990 (open symbols) the entire lake was trapped. Estimates are not directly comparable across these time periods. There are limited data on population age structure that offer valuable insight into the productivity of Borax Lake chub. Williams and Bond (1983) examined lengthfrequency data and concluded that the population consisted primarily of age 1 fish, with few age 2 and age 3 fish present. Limited opercle bone aging of chub collected in 1992- 1993 also indicated that most Borax Lake were less than one year of age (67-79%), yet a few individuals were aged at 10+ years (Scoppettone 1995). Because Borax Lake chub are only found in one location and the population is apparently dominated by a single year-class of adults, the species has a high inherent risk of extinction. 3 The objectives of this study were to: 1) obtain a mark-recapture population estimate of Borax Lake chub, and 2) to evaluate ways to reduce handling of Borax Lake chub when monitoring population abundance both by modifying previous mark-recapture protocols and by developing snorkeling survey protocols to use as an alternative to mark-recapture estimates. In addition, we collected data regarding lake temperatures, chub size (age) structure, and the condition of the fragile lake shoreline and outflows. Close

• 6. [Article] Crook County Lakes and Reservoirs Master Plan for Angler Access and Associated Recreational Uses 1968

  Abstract -- Crook County, located in the central part of the state, encompasses an area of approximately 3,000 square miles. The climate of this region is semiarid, characterized by low winter and high ...

  Citation × Citation Citation Abstract Copy Title: Crook County Lakes and Reservoirs Master Plan for Angler Access and Associated Recreational Uses 1968 Abstract -- Crook County, located in the central part of the state, encompasses an area of approximately 3,000 square miles. The climate of this region is semiarid, characterized by low winter and high summer temperatures. There are at the present time only six bodies of water available for public angling within the county. Prineville and Ochoco Reservoirs are 3,000 and 1,200 acres respectively, and represent 95% of the total water area available to the public. The others are either small reservoirs or ponds with a combined area of less than 225 surface acres. An additional two reservoirs and two private lakes have been recommended for future development . The fishery consists primarily of rainbow trout and a light warm-water fishery in one of the reservoirs. The season opens in April and closes at the end of October, except for Prineville and Ochoco Reservoirs which are open to angling the entire year. Title: Crook County Lakes and Reservoirs Master Plan for Angler Access and Associated Recreational Uses 1968 Abstract -- Crook County, located in the central part of the state, encompasses an area of approximately 3,000 square miles. The climate of this region is semiarid, characterized by low winter and high summer temperatures. There are at the present time only six bodies of water available for public angling within the county. Prineville and Ochoco Reservoirs are 3,000 and 1,200 acres respectively, and represent 95% of the total water area available to the public. The others are either small reservoirs or ponds with a combined area of less than 225 surface acres. An additional two reservoirs and two private lakes have been recommended for future development . The fishery consists primarily of rainbow trout and a light warm-water fishery in one of the reservoirs. The season opens in April and closes at the end of October, except for Prineville and Ochoco Reservoirs which are open to angling the entire year. Close

• 7. [Article] Fish Management Plan Hosmer Lake 1990

  Abstract -- Hosmer Lake and it's water supply are entirely in US Forest Service ownership. The lake and adjacent lands, are managed by the Forest under recreation and visual classifications. The water ...

  Citation × Citation Citation Abstract Copy Title: Fish Management Plan Hosmer Lake 1990 Abstract -- Hosmer Lake and it's water supply are entirely in US Forest Service ownership. The lake and adjacent lands, are managed by the Forest under recreation and visual classifications. The water of the lake is state-owned and the fish resources are managed by the Oregon Department of Fish and Wildlife (ODFW). Hosmer Lake is a natural lake located about 40 miles west of Bend via County Road 46 (Century Drive) and Forest Road 470. One main campground, one overflow campground and a concrete boat ramp are managed by the Deschutes National Forest. Hosmer Lake covers 160 surface acres and lies at an elevation of 4,950 feet. Maximum water depth is 11 feet and most of the lake is very shallow. The only inlet to the lake is Quinn Creek, a spring-fed stream with a flow of 25 cfs and a near-constant temperature of 42°F. Hosmer Lake contains Atlantic salmon ("Salmo salar") and brook trout ("Salvelinus fontinalis"). The lake was chemically treated in 1957 to remove a population of carp ("Cyprinus carpio"), Tui chub ("Siphateles bicolor") and brook trout. The treatment successfully removed all carp and Tui chub, but not all brook trout. Non-game fish have not reappeared since 1957. Originally, it was hoped the Atlantic salmon would spawn successfully in Quinn Creek. However, they cannot ascend the six-foot falls in lower Quinn Creek. The pumice bottom and annual anchor-ice scouring also nullifies egg development. The population of salmon at Hosmer has been maintained soley by hatchery fish since 1958. Title: Fish Management Plan Hosmer Lake 1990 Abstract -- Hosmer Lake and it's water supply are entirely in US Forest Service ownership. The lake and adjacent lands, are managed by the Forest under recreation and visual classifications. The water of the lake is state-owned and the fish resources are managed by the Oregon Department of Fish and Wildlife (ODFW). Hosmer Lake is a natural lake located about 40 miles west of Bend via County Road 46 (Century Drive) and Forest Road 470. One main campground, one overflow campground and a concrete boat ramp are managed by the Deschutes National Forest. Hosmer Lake covers 160 surface acres and lies at an elevation of 4,950 feet. Maximum water depth is 11 feet and most of the lake is very shallow. The only inlet to the lake is Quinn Creek, a spring-fed stream with a flow of 25 cfs and a near-constant temperature of 42°F. Hosmer Lake contains Atlantic salmon ("Salmo salar") and brook trout ("Salvelinus fontinalis"). The lake was chemically treated in 1957 to remove a population of carp ("Cyprinus carpio"), Tui chub ("Siphateles bicolor") and brook trout. The treatment successfully removed all carp and Tui chub, but not all brook trout. Non-game fish have not reappeared since 1957. Originally, it was hoped the Atlantic salmon would spawn successfully in Quinn Creek. However, they cannot ascend the six-foot falls in lower Quinn Creek. The pumice bottom and annual anchor-ice scouring also nullifies egg development. The population of salmon at Hosmer has been maintained soley by hatchery fish since 1958. Close

• 8. [Article] Fish Management Plan Tenmile Lakes System 1981

  Abstract -- The Tenmile Lakes are large, shallow, highly productive freshwater lakes located in Coos County on Oregon's Pacific Coast. North and South Tenmile lakes have respective surface areas of 970 ...

  Citation × Citation Citation Abstract Copy Title: Fish Management Plan Tenmile Lakes System 1981 Abstract -- The Tenmile Lakes are large, shallow, highly productive freshwater lakes located in Coos County on Oregon's Pacific Coast. North and South Tenmile lakes have respective surface areas of 970 and 1,170 acres and are connected by a narrow, shallow canal. Several smaller lakes also drain into Tenmile Creek below the large lakes. The lakes originally contained excellent populations of coho salmon and cutthroat trout. However, these species declined with the development of large populations of warm water fish including largemouth bass, bluegill, yellow perch, and brown bullhead. Management problems in the lakes today concern continued reduction of salmonid populations and high abundance of bluegill. Largemouth bass appear incapable of fully utilizing bluegill as forage. As a result, the Department has considered introducing additional predator species to provide fishing diversity and to better utilize bluegill. Title: Fish Management Plan Tenmile Lakes System 1981 Abstract -- The Tenmile Lakes are large, shallow, highly productive freshwater lakes located in Coos County on Oregon's Pacific Coast. North and South Tenmile lakes have respective surface areas of 970 and 1,170 acres and are connected by a narrow, shallow canal. Several smaller lakes also drain into Tenmile Creek below the large lakes. The lakes originally contained excellent populations of coho salmon and cutthroat trout. However, these species declined with the development of large populations of warm water fish including largemouth bass, bluegill, yellow perch, and brown bullhead. Management problems in the lakes today concern continued reduction of salmonid populations and high abundance of bluegill. Largemouth bass appear incapable of fully utilizing bluegill as forage. As a result, the Department has considered introducing additional predator species to provide fishing diversity and to better utilize bluegill. Close

• 9. [Article] Lake Survey of some Lakes in Deschutes and Willamette National Forests, 1954

  Abstract -- July, August and September, 1954, sixty-two Cascade Mountain lakes were surveyed by the Oregon State Game Commission to collect basic data necessarily for the future management of existing ...

  Citation × Citation Citation Abstract Copy Title: Lake Survey of some Lakes in Deschutes and Willamette National Forests, 1954 Abstract -- July, August and September, 1954, sixty-two Cascade Mountain lakes were surveyed by the Oregon State Game Commission to collect basic data necessarily for the future management of existing trout populations. The survey was devoted to the examination of fish populations, recording water temperatures, physical characteristics and obtaining miscellaneous information pertinent to each lake. The authors spent forty-three working days from July 8 to September 9, 1954 conducting the survey and eleven working days repairing equipment and moving camp to new locations. The location and size of lakes varied. The area of the lakes surveyed ranged from 1 to 85S surface acres Elevation ranged from 4,500 feet to 6,400 feet. Thirty-two lakes were located in the Willamette National Forest in Watershed 2 and thirty were located in Watershed 5 in the Deschutes National Forest. Page 3 contains the names of lakes arranged tn alphabetical order. The survey procedure and analysis was identical to the high lake survey of 1953. Title: Lake Survey of some Lakes in Deschutes and Willamette National Forests, 1954 Abstract -- July, August and September, 1954, sixty-two Cascade Mountain lakes were surveyed by the Oregon State Game Commission to collect basic data necessarily for the future management of existing trout populations. The survey was devoted to the examination of fish populations, recording water temperatures, physical characteristics and obtaining miscellaneous information pertinent to each lake. The authors spent forty-three working days from July 8 to September 9, 1954 conducting the survey and eleven working days repairing equipment and moving camp to new locations. The location and size of lakes varied. The area of the lakes surveyed ranged from 1 to 85S surface acres Elevation ranged from 4,500 feet to 6,400 feet. Thirty-two lakes were located in the Willamette National Forest in Watershed 2 and thirty were located in Watershed 5 in the Deschutes National Forest. Page 3 contains the names of lakes arranged tn alphabetical order. The survey procedure and analysis was identical to the high lake survey of 1953. Close

• 10. [Article] NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth

  Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat ...

  Citation × Citation Citation Abstract Copy Title: NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat partitioning. Both species held focal feeding points in similar microhabitats and fed primarily from the water column rather than from the surface or benthos. In an instream experiment, 20 enclosures were assigned one of three treatments: two bull trout, four bull trout, or a mix of two bull trout and two brook trout. In the enclosures, macroinvertebrate drift was restricted and trout densities were elevated, creating an environment of reduced food and habitat resources. Under these conditions, there was no indication of a niche shift by bull trout; feeding behavior and habitat use by bull trout did not differ depending on the presence or absence of brook trout. Brook trout in the mixed-species treatment were the most aggressive, maintained dominance in 75% of the enclosures, and exhibited significantly higher growth than sympatric bull trout. However, the effects of intra-and interspecific interactions on bull trout growth were equivalent. Given the absence of resource partitioning and a niche shift by bull trout in the presence of brook trout (despite obvious interference interactions), we suggest that the displacement of bull trout by brook trout is likely when resources are scarce. Title: NF - Effect of Bull Trout and Brook Trout Interactions on Foraging Habitat, Feeding Behavior, and Growth Abstract -- Observations of free-ranging sympatric bull trout Salvelinus confluentus and nonnative brook trout S. fontinalis in two eastern Oregon headwater streams provided little evidence of habitat partitioning. Both species held focal feeding points in similar microhabitats and fed primarily from the water column rather than from the surface or benthos. In an instream experiment, 20 enclosures were assigned one of three treatments: two bull trout, four bull trout, or a mix of two bull trout and two brook trout. In the enclosures, macroinvertebrate drift was restricted and trout densities were elevated, creating an environment of reduced food and habitat resources. Under these conditions, there was no indication of a niche shift by bull trout; feeding behavior and habitat use by bull trout did not differ depending on the presence or absence of brook trout. Brook trout in the mixed-species treatment were the most aggressive, maintained dominance in 75% of the enclosures, and exhibited significantly higher growth than sympatric bull trout. However, the effects of intra-and interspecific interactions on bull trout growth were equivalent. Given the absence of resource partitioning and a niche shift by bull trout in the presence of brook trout (despite obvious interference interactions), we suggest that the displacement of bull trout by brook trout is likely when resources are scarce. Close