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• 1. [Image] Age composition of the 1995 Klamath River fall Chinook run

  	The age composition of the in-river run of Klamath River fall chinook is an integral part of the database used to manage this salmon stock. Age composition is used in conjunction with annual estimates ...
  	Citation × Citation Citation Abstract Copy Title: Age composition of the 1995 Klamath River fall Chinook run Year: 1996, 2005 The age composition of the in-river run of Klamath River fall chinook is an integral part of the database used to manage this salmon stock. Age composition is used in conjunction with annual estimates of in-river harvest and escapement to estimate the ocean stock size of Klamath River fall chinook for fishery managment purposes. A total of 13,994 scale samples were examined to estimate the age composition of fall chinook in the Klamath River in 1995. The scales were collected from 13 locations and were aged using scales from coded wire tag recoveries as references. Age composition estimates from each sampling location were weighted by the magnitude of that location's contribution to the inriver run. Because some locations were inadequately sampled, surrogate samples were used represent to them. Angler harvest and in-river run size for 1995 were estimated by applying the age composition to the California Department of Fish and Game's population 'megatable". Seven versions of these estimates are given, using different combinations of surrogate samples. Title: Age composition of the 1995 Klamath River fall Chinook run Year: 1996, 2005 The age composition of the in-river run of Klamath River fall chinook is an integral part of the database used to manage this salmon stock. Age composition is used in conjunction with annual estimates of in-river harvest and escapement to estimate the ocean stock size of Klamath River fall chinook for fishery managment purposes. A total of 13,994 scale samples were examined to estimate the age composition of fall chinook in the Klamath River in 1995. The scales were collected from 13 locations and were aged using scales from coded wire tag recoveries as references. Age composition estimates from each sampling location were weighted by the magnitude of that location's contribution to the inriver run. Because some locations were inadequately sampled, surrogate samples were used represent to them. Angler harvest and in-river run size for 1995 were estimated by applying the age composition to the California Department of Fish and Game's population 'megatable". Seven versions of these estimates are given, using different combinations of surrogate samples. Close

• 2. [Image] Klamath wild and scenic river eligibility report and environmental assessment : Klamath River, Oregon : draft

  	"February 1994." ; "Much of this document was taken directly from, or based on, the Bureau of Land Management's earlier studies of the Klamath River: the Final eligibility and suitability report for the ...
  	Citation × Citation Citation Abstract Copy Title: Klamath wild and scenic river eligibility report and environmental assessment : Klamath River, Oregon : draft Author: United States. National Park Service. Pacific Northwest Region Year: 1994, 2004 "February 1994." ; "Much of this document was taken directly from, or based on, the Bureau of Land Management's earlier studies of the Klamath River: the Final eligibility and suitability report for the Upper Klamath wild and scenic river study and the Draft Klamath Falls area resource management plan and environmental impact statement. This assessment also borrowed heavily from the Final environmental impact statement for the Salt Caves hydroelectric project prepared by the Federal Energy Regulatory Commission."-p.i ; "State of Oregon application, Section 2(a)(ii) National Wild and Scenic Rivers Act." Title: Klamath wild and scenic river eligibility report and environmental assessment : Klamath River, Oregon : draft Author: United States. National Park Service. Pacific Northwest Region Year: 1994, 2004 "February 1994." ; "Much of this document was taken directly from, or based on, the Bureau of Land Management's earlier studies of the Klamath River: the Final eligibility and suitability report for the Upper Klamath wild and scenic river study and the Draft Klamath Falls area resource management plan and environmental impact statement. This assessment also borrowed heavily from the Final environmental impact statement for the Salt Caves hydroelectric project prepared by the Federal Energy Regulatory Commission."-p.i ; "State of Oregon application, Section 2(a)(ii) National Wild and Scenic Rivers Act." Close

• 3. [Image] Economic assessment of the Klamath as a wild and scenic river

  	Recreational use and economic impact of the Salt Caves segment of the Klamath River have been consistently understated. Various citizens and the local press have suggested about 2,000 people use this ...
  	Citation × Citation Citation Abstract Copy Title: Economic assessment of the Klamath as a wild and scenic river Author: Ward, John G. Year: 1987, 2004 Recreational use and economic impact of the Salt Caves segment of the Klamath River have been consistently understated. Various citizens and the local press have suggested about 2,000 people use this segment each year for rafting and an equal number for fishing. Representatives of Resource Management Inc. and various public officials and citizens have estimated annual revenues from the Salt Caves segment of the Klamath River at "less than $4 00,000" to "$500,000 per year". In the interest of building a broader discussion base, the following preliminary economic assessment of the Klamath River canyon has been developed. Background data and estimates are developed for rafting, fishing, and hunting. It is hoped this analysis will help support a more relevant Economic, Social, Environmental, and Energy consequences statement in the Klamath County Comprehensive Plan. Results of the economic assessment for 1986 are summarized below. River use is nearly double the reported levels, and the economic impact of the Salt Caves segment of the Klamath River is over $2.5 million annually. The river now supports 98 jobs through direct, indirect and induced effects, half of them in Oregon. Another 3 00 jobs are partially supported when Oregon and California rafting firms use the river. Title: Economic assessment of the Klamath as a wild and scenic river Author: Ward, John G. Year: 1987, 2004 Recreational use and economic impact of the Salt Caves segment of the Klamath River have been consistently understated. Various citizens and the local press have suggested about 2,000 people use this segment each year for rafting and an equal number for fishing. Representatives of Resource Management Inc. and various public officials and citizens have estimated annual revenues from the Salt Caves segment of the Klamath River at "less than $4 00,000" to "$500,000 per year". In the interest of building a broader discussion base, the following preliminary economic assessment of the Klamath River canyon has been developed. Background data and estimates are developed for rafting, fishing, and hunting. It is hoped this analysis will help support a more relevant Economic, Social, Environmental, and Energy consequences statement in the Klamath County Comprehensive Plan. Results of the economic assessment for 1986 are summarized below. River use is nearly double the reported levels, and the economic impact of the Salt Caves segment of the Klamath River is over $2.5 million annually. The river now supports 98 jobs through direct, indirect and induced effects, half of them in Oregon. Another 3 00 jobs are partially supported when Oregon and California rafting firms use the river. Close

• 4. [Image] 1999 Klamath River fall chinook age composition

  	Title taken from subject line ; "February 9, 2000."
  	Citation × Citation Citation Abstract Copy Title: 1999 Klamath River fall chinook age composition Year: 2000, 2005 Title taken from subject line ; "February 9, 2000." Title: 1999 Klamath River fall chinook age composition Year: 2000, 2005 Title taken from subject line ; "February 9, 2000." Close

• 5. [Image] 1998 Klamath River fall chinook age composition

  	"To: Klamath River Technical Advisory Team." "February 4, 1999."
  	Citation × Citation Citation Abstract Copy Title: 1998 Klamath River fall chinook age composition Year: 1999, 2005 "To: Klamath River Technical Advisory Team." "February 4, 1999." Title: 1998 Klamath River fall chinook age composition Year: 1999, 2005 "To: Klamath River Technical Advisory Team." "February 4, 1999." Close

• 6. [Image] Annual project history: Klamath Project, Oregon-California, 1957

  	INTRODUCTION AND GENERAL General Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath County, Oregon, and ...
  	Citation × Citation Citation Abstract Copy Title: Annual project history: Klamath Project, Oregon-California, 1957 Author: United States. Bureau of Reclamation Year: 1957, 2008, 2006 INTRODUCTION AND GENERAL General Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath County, Oregon, and in Modoc and Siskiyou Counties of California. Project headquarters is located at the principal city of Klamath Falls, Oregon, which has a population of about 35>700, including suburbs. Smaller towns on the project in Oregon are Merrill, Malin, and Bonanza. The town of Tulelake, California, was established in 1931 near the center of the Tule Lake Division. Climate. The mean temperature for the wannest month is 630 F. The coldest month has mean temperature of 29? F. Summer nights are cool. The annual rainfall is about 13 inches, of which about 3?-inches fall during the growing season of 90 to 130 days. Topography, soils, and crops. The project area is about ^-,100 feet elevation above sea level. The surface topography is generally smooth and flat for the large areas of lake bottom, and gently sloping on the higher lands. Peat and muck soils are common in the recent lake bottoms. Soils vary from sandy loam to clay on other parts of the project. The principal crops grown are alfalfa, malting and feed barley, potatoes, clover seed, and irrigated pasture and other forage. Stock raising is an important enterprise. Industry and transportation. Farming and lumbering each provide the major portion of the economy of the Basin. Three major railroad lines, one major highway and many secondary highways, and two airlines serve the project area. Plan and purpose. The project serves 211,000 acres. The water supply is provided by two main water courses, Klamath River and Lost River and their tributaries. Besides storing, diverting, and distributing water for irrigation, project facilities have reclaimed by drainage large areas formerly inundated by Lower Klamath and Tule Lakes* Flood waters of Lost River, which terminates in Tule Lake, are diverted to the Klamath River through the Lost River Diversion Channel. This channel is also used to carry irrigation water in the opposite direction in the summertime. Another principal function of the project is water-level control for the Tule Lake and Lower Klamath Lake National Wildlife Refuges. Upper Klamath Lake on the Klamath River is the principal storage reservoir, having an active capacity of 52U,800 acre-feet. It is controlled by Link River Dam constructed, maintained, and operated INTRODUCTION AND GENERAL (Continued) General Description of the Project (Cont.) by The California Oregon Power Company under an agreement with the project whereby irrigation requirements and rights are protected. The Main, Lower Klamath, and Tule Lake Divisions are served from this source, Gerber Reservoir on Miller Creek and Clear Lake Reservoir on Lost River provide flood control for the Tule Lake Division and an irrigation supply for the Langell Valley Division. Their active storage capacities are 9*^300 acre-feet and 513*300 acre-feet, respectively. Federally-financed project works also include the diversion, distribution, and drainage systems for the Main and Tule Lake Divisions; the diversion dam and main canals for the Langell Valley Division; and drainage outlets for the Lower Klamath and Tule Lake Divisions. Title: Annual project history: Klamath Project, Oregon-California, 1957 Author: United States. Bureau of Reclamation Year: 1957, 2008, 2006 INTRODUCTION AND GENERAL General Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath County, Oregon, and in Modoc and Siskiyou Counties of California. Project headquarters is located at the principal city of Klamath Falls, Oregon, which has a population of about 35>700, including suburbs. Smaller towns on the project in Oregon are Merrill, Malin, and Bonanza. The town of Tulelake, California, was established in 1931 near the center of the Tule Lake Division. Climate. The mean temperature for the wannest month is 630 F. The coldest month has mean temperature of 29? F. Summer nights are cool. The annual rainfall is about 13 inches, of which about 3?-inches fall during the growing season of 90 to 130 days. Topography, soils, and crops. The project area is about ^-,100 feet elevation above sea level. The surface topography is generally smooth and flat for the large areas of lake bottom, and gently sloping on the higher lands. Peat and muck soils are common in the recent lake bottoms. Soils vary from sandy loam to clay on other parts of the project. The principal crops grown are alfalfa, malting and feed barley, potatoes, clover seed, and irrigated pasture and other forage. Stock raising is an important enterprise. Industry and transportation. Farming and lumbering each provide the major portion of the economy of the Basin. Three major railroad lines, one major highway and many secondary highways, and two airlines serve the project area. Plan and purpose. The project serves 211,000 acres. The water supply is provided by two main water courses, Klamath River and Lost River and their tributaries. Besides storing, diverting, and distributing water for irrigation, project facilities have reclaimed by drainage large areas formerly inundated by Lower Klamath and Tule Lakes* Flood waters of Lost River, which terminates in Tule Lake, are diverted to the Klamath River through the Lost River Diversion Channel. This channel is also used to carry irrigation water in the opposite direction in the summertime. Another principal function of the project is water-level control for the Tule Lake and Lower Klamath Lake National Wildlife Refuges. Upper Klamath Lake on the Klamath River is the principal storage reservoir, having an active capacity of 52U,800 acre-feet. It is controlled by Link River Dam constructed, maintained, and operated INTRODUCTION AND GENERAL (Continued) General Description of the Project (Cont.) by The California Oregon Power Company under an agreement with the project whereby irrigation requirements and rights are protected. The Main, Lower Klamath, and Tule Lake Divisions are served from this source, Gerber Reservoir on Miller Creek and Clear Lake Reservoir on Lost River provide flood control for the Tule Lake Division and an irrigation supply for the Langell Valley Division. Their active storage capacities are 9*^300 acre-feet and 513*300 acre-feet, respectively. Federally-financed project works also include the diversion, distribution, and drainage systems for the Main and Tule Lake Divisions; the diversion dam and main canals for the Langell Valley Division; and drainage outlets for the Lower Klamath and Tule Lake Divisions. Close

• 7. [Image] Annual project history: Klamath Project, Oregon-California, 1958

  	INTRODUCTION AND GENERAL Genex*al Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath Comity, Oregon, ...
  	Citation × Citation Citation Abstract Copy Title: Annual project history: Klamath Project, Oregon-California, 1958 Author: United States. Bureau of Reclamation Year: 1958, 2008, 2006 INTRODUCTION AND GENERAL Genex*al Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath Comity, Oregon, and in Modoc and Siskiyou Counties of California. Project headquarters is located at the principal city of Klamath Falls, Oregon, which has a population of about 3&>^00, including suburbs. Smaller towns on the project in Oregon are Merrill, Malin, and Bonanza. The town of Tulelake, California, was established in 1931 near the center of the Tule Lake Division. Climate ? The mean temperature for the warmest month is 630 F. The coldest month has raez.n temperature of 29? F. Summer nights are cool. The annual rainfall is about 13 inches, of which about 3^ inches fall during the growing season of 90 to 130 days. Topography, soils, and crops. The project area is about U,100 feet elevation above sea level. The surface topography is generally smooth and flat for the large areas of lake bottom, and gently sloping on the higher lands? Peat and muck soils are common in the recent lake bottoms. Soils vary from sandy loam to clay on other parts of the project. The principal crops grown are alfalfa, malting and feed barley, potatoes, clover seed, and irrigated pasture and other forage. Stock raising is an important enterprise. Industry and transportation. Farming and lumbering each provide the major portion of the economy of the Basin. Three major railroad lines, one major highway and many secondary highways, and two airlines serve the project area. Plan and purpose. In 1958 the project provided irrigation service to 21^,500 acres. The water supply is provided by two main water courses, Klamath River and Lost River and their tributaries. Besides storing, diverting, and distributing water for irrigation, project facilities have reclaimed by drainage large areas formerly inundated by Lower Klamath and Tule Lakes. Flood waters of Lost River, which terminates In Tule Lake, are diverted to the Klamath River through the Lost River Diversion Channel. This channel is also used to carry irrigation water in the opposite direction in the summertime. Another principal function of the project is water-level control for the Tule Lake and Lower Klamath Lake National Wildlife Refuges. DTERODUCTIOH AND GBNKRAL (Continued) General Description of the Project (Cont.) Upper Klamath Lake on the Klamath River is the principal storage reservoir, having an active capacity of 52^,800 acre-feet. It is controlled by Link River Dam constructed, maintained, and operated by The California Oregon Power Company under an agreement with the project whereby irrigation requirements and rights are protected. The Main, Lower Klamath, and Tule Lake Divisions are served from this source. Gerber Reservoir on Miller Creel; and Clear Lake Reservoir on Lost River provide flood control for the Tule Lake Division and an irrigation supply for the Langell Valley Division. Their active storage capacities are 9*b3OO acre-feet and 513*300 acre-feet, respectively. Federally-financed project works also include the diversion, distribution, and drainage systems for the Main and Tule Lake Divisions; the diversion darn and main canals for the Langell Valley Division; and drainage outlets for the Lower Klamath and Tule Lake Divisions? Title: Annual project history: Klamath Project, Oregon-California, 1958 Author: United States. Bureau of Reclamation Year: 1958, 2008, 2006 INTRODUCTION AND GENERAL Genex*al Description of the Project Location. The Klamath Project is in the Upper Klamath River Basin, east of the Cascade Range. It is located in Klamath Comity, Oregon, and in Modoc and Siskiyou Counties of California. Project headquarters is located at the principal city of Klamath Falls, Oregon, which has a population of about 3&>^00, including suburbs. Smaller towns on the project in Oregon are Merrill, Malin, and Bonanza. The town of Tulelake, California, was established in 1931 near the center of the Tule Lake Division. Climate ? The mean temperature for the warmest month is 630 F. The coldest month has raez.n temperature of 29? F. Summer nights are cool. The annual rainfall is about 13 inches, of which about 3^ inches fall during the growing season of 90 to 130 days. Topography, soils, and crops. The project area is about U,100 feet elevation above sea level. The surface topography is generally smooth and flat for the large areas of lake bottom, and gently sloping on the higher lands? Peat and muck soils are common in the recent lake bottoms. Soils vary from sandy loam to clay on other parts of the project. The principal crops grown are alfalfa, malting and feed barley, potatoes, clover seed, and irrigated pasture and other forage. Stock raising is an important enterprise. Industry and transportation. Farming and lumbering each provide the major portion of the economy of the Basin. Three major railroad lines, one major highway and many secondary highways, and two airlines serve the project area. Plan and purpose. In 1958 the project provided irrigation service to 21^,500 acres. The water supply is provided by two main water courses, Klamath River and Lost River and their tributaries. Besides storing, diverting, and distributing water for irrigation, project facilities have reclaimed by drainage large areas formerly inundated by Lower Klamath and Tule Lakes. Flood waters of Lost River, which terminates In Tule Lake, are diverted to the Klamath River through the Lost River Diversion Channel. This channel is also used to carry irrigation water in the opposite direction in the summertime. Another principal function of the project is water-level control for the Tule Lake and Lower Klamath Lake National Wildlife Refuges. DTERODUCTIOH AND GBNKRAL (Continued) General Description of the Project (Cont.) Upper Klamath Lake on the Klamath River is the principal storage reservoir, having an active capacity of 52^,800 acre-feet. It is controlled by Link River Dam constructed, maintained, and operated by The California Oregon Power Company under an agreement with the project whereby irrigation requirements and rights are protected. The Main, Lower Klamath, and Tule Lake Divisions are served from this source. Gerber Reservoir on Miller Creel; and Clear Lake Reservoir on Lost River provide flood control for the Tule Lake Division and an irrigation supply for the Langell Valley Division. Their active storage capacities are 9*b3OO acre-feet and 513*300 acre-feet, respectively. Federally-financed project works also include the diversion, distribution, and drainage systems for the Main and Tule Lake Divisions; the diversion darn and main canals for the Langell Valley Division; and drainage outlets for the Lower Klamath and Tule Lake Divisions? Close

• 8. [Image] Region II Klamath Project annual history, 1945

  	Ill., maps (some color), photographs; Includes fiscal year financials, photographs, crop and livestock yields, water storage and distribution, hydrography report, etc.; Title covers: calendar years for ...
  	Citation × Citation Citation Abstract Copy Title: Region II Klamath Project annual history, 1945 Author: United States. Bureau of Reclamation Year: 1945, 2008 Ill., maps (some color), photographs; Includes fiscal year financials, photographs, crop and livestock yields, water storage and distribution, hydrography report, etc.; Title covers: calendar years for 1944 – 1945; Description is based on: Region II Klamath Project annual history 1944. Contains three parts and three table of contents.; Dates of the beginning year(s) of publication are derived from May 1, 1903 to December 31, 1912, History of the Klamath Project and from the volume information on later volumes (v. 35) Klamath District and Klamath Project Annual history for 1945, dated December 1, 1946 Title: Region II Klamath Project annual history, 1945 Author: United States. Bureau of Reclamation Year: 1945, 2008 Ill., maps (some color), photographs; Includes fiscal year financials, photographs, crop and livestock yields, water storage and distribution, hydrography report, etc.; Title covers: calendar years for 1944 – 1945; Description is based on: Region II Klamath Project annual history 1944. Contains three parts and three table of contents.; Dates of the beginning year(s) of publication are derived from May 1, 1903 to December 31, 1912, History of the Klamath Project and from the volume information on later volumes (v. 35) Klamath District and Klamath Project Annual history for 1945, dated December 1, 1946 Close

• 9. [Image] Water quality and nutrient loading in the Klamath River between Keno, Oregon and Seiad Valley, California from 1996-1998

  	ABSTRACT A water quality study was performed in the mainstem Klamath River from Keno, Oregon to Seiad Valley, California during 1996 through 1998. Four sites within the study area were continuously ...
  	Citation × Citation Citation Abstract Copy Title: Water quality and nutrient loading in the Klamath River between Keno, Oregon and Seiad Valley, California from 1996-1998 Author: Campbell, S. G Year: 2001, 2007, 2005 ABSTRACT A water quality study was performed in the mainstem Klamath River from Keno, Oregon to Seiad Valley, California during 1996 through 1998. Four sites within the study area were continuously monitored using multiparameter recorders. Water quality sampling was also performed at these four locations in 1996 and 1997. Additional water quality sampling sites were added in 1998 for a total of 8 locations between Keno and Seiad. Temperature ranged from near zero ?C to >25 ?C with cooler temperatures in early spring and fall, and maximum temperatures occurring in July and August of each year. Dissolved oxygen concentration ranged from near zero mg/L to >13 mg/L with highest DO occurring in early spring and fall and lowest DO occurring in mid-summer. Air temperature was generally highly correlated with water temperature with r values ranging from 0.8 to 0.9 during the study period from 1996-1998. Water temperature in the study area exceeded chronic (>16?C) and acute (>22?C) criteria for salmonids during the summer months. Although chronic DO (<7 mg/L) criteria were exceeded throughout most of the study area during the summer, in the free-flowing river below Iron Gate Dam the acute DO (<5.5 mg/L) criteria were not exceeded. Nonpoint source pollution in the form of agricultural return flows, industrial, or sewage effluent entering the stream may have resulted in higher ammonia and total organic nitrogen concentrations at the upstream locations in the Klamath River study area (Keno and J.C. Boyle Powerplant). Nitrification of ammonia and organic nitrogen seemed to result in higher concentrations of nitrate in the downstream Klamath River (Iron Gate Dam). Total phosphorus concentration stayed relatively stable through the reservoirs in the study area, but decreased in the downstream direction between Iron Gate Dam and Seiad. Ortho-phosphorus concentrations increased longitudinally through the reservoirs, then decreased in the downstream direction between Iron Gate Dam and Seiad. An increase in ortho-phosphorus concentration can indicate internal cycling occurring in the reservoirs as well as photosynthesis. On an annual basis total phosphorus loading increased longitudinally from up- to downstream between Keno and Seiad. The increase was statistically significant (p = .03) indicating that the reservoirs in series in the Klamath River study area do not function as a nutrient sink. However, during the summer there was no statistically significant difference in total P loading when Keno, Iron Gate and Seiad locations were compared, therefore, the reservoirs may act as a nutrient sink seasonally. The Klamath River study locations were generally nitrogen limited, although at Keno, a regular change from N limitation to P limitation occurred during the fall of all three years of the study. When the Klamath River annual nutrient loading values are compared to other rivers in the vicinity, the Carson, Truckee, and Long Tom Rivers also appear to be nutrient enriched. The Carson and South Yamhill Rivers seem to be N limited systems and the Wood, Long Tom, Snake and Truckee Rivers seem to be P limited systems. Implementing management strategies for reservoir operations to improve water quality and reduce nutrient concentration or loading in the Klamath River study area to benefit anadromous fisheries may be difficult and expensive. However, improving the thermal regime in spring to benefit YOY salmonids may be possible as is short-term relief in fate summer for over-summering species. Decreases in nutrient concentration or loading accomplished through best management practices in the water shed may allow general protection of water resources in the Klamath Basin for future needs. Title: Water quality and nutrient loading in the Klamath River between Keno, Oregon and Seiad Valley, California from 1996-1998 Author: Campbell, S. G Year: 2001, 2007, 2005 ABSTRACT A water quality study was performed in the mainstem Klamath River from Keno, Oregon to Seiad Valley, California during 1996 through 1998. Four sites within the study area were continuously monitored using multiparameter recorders. Water quality sampling was also performed at these four locations in 1996 and 1997. Additional water quality sampling sites were added in 1998 for a total of 8 locations between Keno and Seiad. Temperature ranged from near zero ?C to >25 ?C with cooler temperatures in early spring and fall, and maximum temperatures occurring in July and August of each year. Dissolved oxygen concentration ranged from near zero mg/L to >13 mg/L with highest DO occurring in early spring and fall and lowest DO occurring in mid-summer. Air temperature was generally highly correlated with water temperature with r values ranging from 0.8 to 0.9 during the study period from 1996-1998. Water temperature in the study area exceeded chronic (>16?C) and acute (>22?C) criteria for salmonids during the summer months. Although chronic DO (<7 mg/L) criteria were exceeded throughout most of the study area during the summer, in the free-flowing river below Iron Gate Dam the acute DO (<5.5 mg/L) criteria were not exceeded. Nonpoint source pollution in the form of agricultural return flows, industrial, or sewage effluent entering the stream may have resulted in higher ammonia and total organic nitrogen concentrations at the upstream locations in the Klamath River study area (Keno and J.C. Boyle Powerplant). Nitrification of ammonia and organic nitrogen seemed to result in higher concentrations of nitrate in the downstream Klamath River (Iron Gate Dam). Total phosphorus concentration stayed relatively stable through the reservoirs in the study area, but decreased in the downstream direction between Iron Gate Dam and Seiad. Ortho-phosphorus concentrations increased longitudinally through the reservoirs, then decreased in the downstream direction between Iron Gate Dam and Seiad. An increase in ortho-phosphorus concentration can indicate internal cycling occurring in the reservoirs as well as photosynthesis. On an annual basis total phosphorus loading increased longitudinally from up- to downstream between Keno and Seiad. The increase was statistically significant (p = .03) indicating that the reservoirs in series in the Klamath River study area do not function as a nutrient sink. However, during the summer there was no statistically significant difference in total P loading when Keno, Iron Gate and Seiad locations were compared, therefore, the reservoirs may act as a nutrient sink seasonally. The Klamath River study locations were generally nitrogen limited, although at Keno, a regular change from N limitation to P limitation occurred during the fall of all three years of the study. When the Klamath River annual nutrient loading values are compared to other rivers in the vicinity, the Carson, Truckee, and Long Tom Rivers also appear to be nutrient enriched. The Carson and South Yamhill Rivers seem to be N limited systems and the Wood, Long Tom, Snake and Truckee Rivers seem to be P limited systems. Implementing management strategies for reservoir operations to improve water quality and reduce nutrient concentration or loading in the Klamath River study area to benefit anadromous fisheries may be difficult and expensive. However, improving the thermal regime in spring to benefit YOY salmonids may be possible as is short-term relief in fate summer for over-summering species. Decreases in nutrient concentration or loading accomplished through best management practices in the water shed may allow general protection of water resources in the Klamath Basin for future needs. Close

• 10. [Image] Chronic toxicity of low dissolved oxygen concentrations, elevated pH, and elevated ammonia concentrations to lost river suckers (deltistes luxatus), and swimming performance of lost river suckers at various temperatures.

  	The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity ...
  	Citation × Citation Citation Abstract Copy Title: Chronic toxicity of low dissolved oxygen concentrations, elevated pH, and elevated ammonia concentrations to lost river suckers (deltistes luxatus), and swimming performance of lost river suckers at various temperatures. Author: Meyer, Joseph S. Year: 2000, 2007, 2006 The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity and temperature changes. The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity and temperature changes. Title: Chronic toxicity of low dissolved oxygen concentrations, elevated pH, and elevated ammonia concentrations to lost river suckers (deltistes luxatus), and swimming performance of lost river suckers at various temperatures. Author: Meyer, Joseph S. Year: 2000, 2007, 2006 The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity and temperature changes. The study examines two species of sucker,the shortnose sucker(chasmistes brevirostrix), and the Lost River sucker,(deltisties luxatus) that inhabit Upper Klamath Lake and the effects of chronic toxicity and temperature changes. Close