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• 91. [Image] Upper Klamath Lake Basin nutrient-loading study: assessment of historic flows in the Williamson and Sprague Rivers

  	"The goal of the project is to quantitatively describe the nature and extent of the ground-water flow systems in the basin."
  	Citation × Citation Citation Abstract Copy Title: Upper Klamath Lake Basin nutrient-loading study: assessment of historic flows in the Williamson and Sprague Rivers Author: Risley, John C. Year: 1999, 2005, 2004 "The goal of the project is to quantitatively describe the nature and extent of the ground-water flow systems in the basin." Title: Upper Klamath Lake Basin nutrient-loading study: assessment of historic flows in the Williamson and Sprague Rivers Author: Risley, John C. Year: 1999, 2005, 2004 "The goal of the project is to quantitatively describe the nature and extent of the ground-water flow systems in the basin." Close

• 92. [Image] Effect of water-column pH on sediment-phosphorus release rates in Upper Klamath Lake, Oregon, 2001

  	Abstract Sediment-phosphorus release rates as a function of pH were determined in laboratory experiments for sediment and water samples collected from Shoalwater Bay in Upper Klamath Lake, Oregon, in 2001. ...
  	Citation × Citation Citation Abstract Copy Title: Effect of water-column pH on sediment-phosphorus release rates in Upper Klamath Lake, Oregon, 2001 Author: Fisher, Lawrence H. Year: 2004, 2005 Abstract Sediment-phosphorus release rates as a function of pH were determined in laboratory experiments for sediment and water samples collected from Shoalwater Bay in Upper Klamath Lake, Oregon, in 2001. Areal release rates for a stable sediment/water interface that is representative of the sediment surface area to water column volume ratio (1:3) observed in the lake and volumetric release rates for resuspended sediment events were determined at three different pH values (8.1, 9.2, 10.2). Ambient water column pH (8.1) was maintained by sparging study columns with atmospheric air. Elevation of the water column pH to 9.2 was achieved through the removal of dissolved carbon dioxide by sparging with carbon dioxide-reduced air, partially simulating water chemistry changes that occur during algal photosynthesis. Further elevation of the pH to 10.2 was achieved by the addition of sodium hydroxide, which doubled average alkalinities in the study columns from about 1 to 2 milliequivalents per liter. Upper Klamath Lake sediments collected from the lake bottom and then placed in contact with lake water, either at a stable sediment/water interface or by resus-pension, exhibited an initial capacity to take up soluble reactive phosphorus (SRP) from the water column rather than release phosphorus to the water column. At a higher pH this initial uptake of phosphorus was slowed, but not stopped. This initial phase was followed by a reversal in which the sediments began to release SRP back into the water column. The release rate of phosphorus 30 to 40 days after suspension of sediments in the columns was 0.5 |ig/L/day (micrograms per liter per day) at pH 8, and 0.9 |ug/L/day at pH 10, indicating that the higher pH increased the rate of phosphorus release by a factor of about two. The highest determined rate of release was approximately 10% (percent) of the rate required to explain the annual internal loading to Upper Klamath Lake from the sediments as calculated from a lake-wide mass balance and observed in total phosphorus data collected at individual locations. Title: Effect of water-column pH on sediment-phosphorus release rates in Upper Klamath Lake, Oregon, 2001 Author: Fisher, Lawrence H. Year: 2004, 2005 Abstract Sediment-phosphorus release rates as a function of pH were determined in laboratory experiments for sediment and water samples collected from Shoalwater Bay in Upper Klamath Lake, Oregon, in 2001. Areal release rates for a stable sediment/water interface that is representative of the sediment surface area to water column volume ratio (1:3) observed in the lake and volumetric release rates for resuspended sediment events were determined at three different pH values (8.1, 9.2, 10.2). Ambient water column pH (8.1) was maintained by sparging study columns with atmospheric air. Elevation of the water column pH to 9.2 was achieved through the removal of dissolved carbon dioxide by sparging with carbon dioxide-reduced air, partially simulating water chemistry changes that occur during algal photosynthesis. Further elevation of the pH to 10.2 was achieved by the addition of sodium hydroxide, which doubled average alkalinities in the study columns from about 1 to 2 milliequivalents per liter. Upper Klamath Lake sediments collected from the lake bottom and then placed in contact with lake water, either at a stable sediment/water interface or by resus-pension, exhibited an initial capacity to take up soluble reactive phosphorus (SRP) from the water column rather than release phosphorus to the water column. At a higher pH this initial uptake of phosphorus was slowed, but not stopped. This initial phase was followed by a reversal in which the sediments began to release SRP back into the water column. The release rate of phosphorus 30 to 40 days after suspension of sediments in the columns was 0.5 |ig/L/day (micrograms per liter per day) at pH 8, and 0.9 |ug/L/day at pH 10, indicating that the higher pH increased the rate of phosphorus release by a factor of about two. The highest determined rate of release was approximately 10% (percent) of the rate required to explain the annual internal loading to Upper Klamath Lake from the sediments as calculated from a lake-wide mass balance and observed in total phosphorus data collected at individual locations. Close

• 93. [Image] Federal Register - Endangered and Threatened Wildlife and Plants; Proposed Determination of Critical Habitat for Lost River Sucker and Shortnose Sucker

  	The Fish and Wildlife Service (Service) proposes to designate critical habitat for the Lost River sucker {Deltistes luxatus) and shortnose sucker [Chasmistes brevirostris), two species federally listed ...
  	Citation × Citation Citation Abstract Copy Title: Federal Register - Endangered and Threatened Wildlife and Plants; Proposed Determination of Critical Habitat for Lost River Sucker and Shortnose Sucker Year: 1994, 2008, 2005 The Fish and Wildlife Service (Service) proposes to designate critical habitat for the Lost River sucker {Deltistes luxatus) and shortnose sucker [Chasmistes brevirostris), two species federally listed as endangered pursuant to the Endangered Species Act of 1973. as amended (Act). Both species are large, long-lived fish endemic to the Upper Klamath River Basin of Oregon and California. The proposed designation includes a total of approximately 182,400 hectares (456,000 acres) of stream, river, lake, and shoreline areas as critical habitat for the shortnose sucker and approximately 170,000 hectares (424,000 acres) of stream, river, lake, and shoreline areas as critical habitat for the Lost River sucker. This proposed critical habitat designation would result in additional review requirements under section 7 of the Act with regard to Federal agency actions. Section 4 of the Act requires the Service to consider economic costs and benefits prior to making a final decision on the size and scope of critical habitat Title: Federal Register - Endangered and Threatened Wildlife and Plants; Proposed Determination of Critical Habitat for Lost River Sucker and Shortnose Sucker Year: 1994, 2008, 2005 The Fish and Wildlife Service (Service) proposes to designate critical habitat for the Lost River sucker {Deltistes luxatus) and shortnose sucker [Chasmistes brevirostris), two species federally listed as endangered pursuant to the Endangered Species Act of 1973. as amended (Act). Both species are large, long-lived fish endemic to the Upper Klamath River Basin of Oregon and California. The proposed designation includes a total of approximately 182,400 hectares (456,000 acres) of stream, river, lake, and shoreline areas as critical habitat for the shortnose sucker and approximately 170,000 hectares (424,000 acres) of stream, river, lake, and shoreline areas as critical habitat for the Lost River sucker. This proposed critical habitat designation would result in additional review requirements under section 7 of the Act with regard to Federal agency actions. Section 4 of the Act requires the Service to consider economic costs and benefits prior to making a final decision on the size and scope of critical habitat Close

• 94. [Image] Federal Register - Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for the Klamath River and Columbia River Populations of Bull Trout

  	We, the U.S. Fish and Wildlife Service (Service), designate critical habitat for the Klamath River and Columbia River populations of bull trout {Salvelinus confluentus) pursuant to the Endangered Species ...
  	Citation × Citation Citation Abstract Copy Title: Federal Register - Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for the Klamath River and Columbia River Populations of Bull Trout Year: 2004, 2008, 2005 We, the U.S. Fish and Wildlife Service (Service), designate critical habitat for the Klamath River and Columbia River populations of bull trout {Salvelinus confluentus) pursuant to the Endangered Species Act of 1973, as amended (Act). For the Klamath River and Columbia River populations of bull trout, the critical habitat designation includes approximately 1,748 miles (mi) (2,813 kilometers (km)) of streams and 61,235 acres (ac) (24,781 hectares (ha)) of lakes and marshes. We solicited data and comments from the public on all aspects of the proposed rule, including data on economic and other impacts of the designation Title: Federal Register - Endangered and Threatened Wildlife and Plants; Designation of Critical Habitat for the Klamath River and Columbia River Populations of Bull Trout Year: 2004, 2008, 2005 We, the U.S. Fish and Wildlife Service (Service), designate critical habitat for the Klamath River and Columbia River populations of bull trout {Salvelinus confluentus) pursuant to the Endangered Species Act of 1973, as amended (Act). For the Klamath River and Columbia River populations of bull trout, the critical habitat designation includes approximately 1,748 miles (mi) (2,813 kilometers (km)) of streams and 61,235 acres (ac) (24,781 hectares (ha)) of lakes and marshes. We solicited data and comments from the public on all aspects of the proposed rule, including data on economic and other impacts of the designation Close

• 95. [Image] Klamath River fish die-off, September 2002 : causative factors of mortality

  	Executive Summary This report provides information describing the biological, hydrological, meteorological, and water quality conditions associated with the die-off of an estimated 34,056 fish in the Klamath ...
  	Citation × Citation Citation Abstract Copy Title: Klamath River fish die-off, September 2002 : causative factors of mortality Author: Guillen, George Year: 2003, 2005, 2004 Executive Summary This report provides information describing the biological, hydrological, meteorological, and water quality conditions associated with the die-off of an estimated 34,056 fish in the Klamath River, California in September 2002. The proximate cause of death was heavy infections of two fish pathogens, Ich and columnaris. However, given that these ubiquitous pathogens are normally found in the Klamath River, additional factors must have played a role for them to have become lethal. It is our conclusion based on multiple lines of evidence that the fish die-off in the lower Klamath River in 2002 was a result of a combination of factors that began with an early peak in the return of a large run of fall Chinook salmon. Low river discharges apparently did not provide suitable attraction flows for migrating adult salmon, resulting in large numbers of fish congregating in the warm waters of the lower River. The high density offish, low discharges, warm water temperatures, and possible extended residence time of salmon created optimal conditions for parasite proliferation and precipitated an epizootic of Ich and columnaris. Based on a review of available literature and historical records, this was the largest known pre-spawning adult salmonid die-off recorded for the Klamath River and possibly the Pacific coast. Title: Klamath River fish die-off, September 2002 : causative factors of mortality Author: Guillen, George Year: 2003, 2005, 2004 Executive Summary This report provides information describing the biological, hydrological, meteorological, and water quality conditions associated with the die-off of an estimated 34,056 fish in the Klamath River, California in September 2002. The proximate cause of death was heavy infections of two fish pathogens, Ich and columnaris. However, given that these ubiquitous pathogens are normally found in the Klamath River, additional factors must have played a role for them to have become lethal. It is our conclusion based on multiple lines of evidence that the fish die-off in the lower Klamath River in 2002 was a result of a combination of factors that began with an early peak in the return of a large run of fall Chinook salmon. Low river discharges apparently did not provide suitable attraction flows for migrating adult salmon, resulting in large numbers of fish congregating in the warm waters of the lower River. The high density offish, low discharges, warm water temperatures, and possible extended residence time of salmon created optimal conditions for parasite proliferation and precipitated an epizootic of Ich and columnaris. Based on a review of available literature and historical records, this was the largest known pre-spawning adult salmonid die-off recorded for the Klamath River and possibly the Pacific coast. Close

• 96. [Image] Klamath River Basin Compact between the states of Oregon and California

  	"Ratified by state of Oregon, April 17, 1957 ... and state of California, April 17, 1957 ... consented to by the United States Congress ..."; "[R]epresentative of the United States of America, the States ...
  	Citation × Citation Citation Abstract Copy Title: Klamath River Basin Compact between the states of Oregon and California Year: 1957, 2004 "Ratified by state of Oregon, April 17, 1957 ... and state of California, April 17, 1957 ... consented to by the United States Congress ..."; "[R]epresentative of the United States of America, the States of California and Oregon have agreed on the compact articles hereinafter set out which were approved by the Klamath River Commissions of Oregon and California on November 17, 1956, and ratified by the Legislatures of Oregon (Chap. 142, Oregon State Laws 1957) and California (Chap. 113, Calif. Statutes 1957) on April 17, 1957. This compact was consented to by Act of Congress (71 Stat. 497) on August 30, 1957, and became effective on September 11, 1957." Title: Klamath River Basin Compact between the states of Oregon and California Year: 1957, 2004 "Ratified by state of Oregon, April 17, 1957 ... and state of California, April 17, 1957 ... consented to by the United States Congress ..."; "[R]epresentative of the United States of America, the States of California and Oregon have agreed on the compact articles hereinafter set out which were approved by the Klamath River Commissions of Oregon and California on November 17, 1956, and ratified by the Legislatures of Oregon (Chap. 142, Oregon State Laws 1957) and California (Chap. 113, Calif. Statutes 1957) on April 17, 1957. This compact was consented to by Act of Congress (71 Stat. 497) on August 30, 1957, and became effective on September 11, 1957." Close

• 97. [Image] Sediment oxygen demand in Upper Klamath and Agency Lakes, Oregon, 1999

  	SIGNIFICANT FINDINGS The distribution of SOD2q values (measured sediment oxygen demand values corrected to 20°C [degrees Celsius]) had a median value of 1.6 g/m2/day (grams per square meter per day) in ...
  	Citation × Citation Citation Abstract Copy Title: Sediment oxygen demand in Upper Klamath and Agency Lakes, Oregon, 1999 Author: Wood, Tamara M. Year: 2001, 2005, 2004 SIGNIFICANT FINDINGS The distribution of SOD2q values (measured sediment oxygen demand values corrected to 20°C [degrees Celsius]) had a median value of 1.6 g/m2/day (grams per square meter per day) in the spring and 1.7 g/m2/day in the late summer. These values were well within the range of values in the literature for sites with similar sediment characteristics: primarily silty with at least a moderate amount of organic content. Over most of the lake there appears to be relatively little variation in SOD 14the interquartile range in values was 0.4 g/m2/day in the spring and 0.7 g/m2/day in the late summer. A significant exception was apparent in Ball Bay, where SOD in the late summer was greater than 10.2 g/m2/day. In the absence of primary production, an SOD of this magnitude could deplete the water column of oxygen in a few days. This measurement provided evidence that localized areas of very high SOD occur episodically in the bays, perhaps associated with large algal mats being trapped by the lake circulation patterns. A statistical test for a spring to late summer difference in the median values of SOD confirmed that SOD in the late summer (median value 1.7 g/m2/day) was significantly higher than in the spring (median value 1.2 g/m2/day). The difference was primarily due to seasonal changes in temperature; when SOD values were corrected to 20°C, there was no seasonal difference in the median values. There was no correlation between SOD20 and the sediment characteristics measured in this study: percent fines, organic carbon, and residue lost on ignition. Title: Sediment oxygen demand in Upper Klamath and Agency Lakes, Oregon, 1999 Author: Wood, Tamara M. Year: 2001, 2005, 2004 SIGNIFICANT FINDINGS The distribution of SOD2q values (measured sediment oxygen demand values corrected to 20°C [degrees Celsius]) had a median value of 1.6 g/m2/day (grams per square meter per day) in the spring and 1.7 g/m2/day in the late summer. These values were well within the range of values in the literature for sites with similar sediment characteristics: primarily silty with at least a moderate amount of organic content. Over most of the lake there appears to be relatively little variation in SOD 14the interquartile range in values was 0.4 g/m2/day in the spring and 0.7 g/m2/day in the late summer. A significant exception was apparent in Ball Bay, where SOD in the late summer was greater than 10.2 g/m2/day. In the absence of primary production, an SOD of this magnitude could deplete the water column of oxygen in a few days. This measurement provided evidence that localized areas of very high SOD occur episodically in the bays, perhaps associated with large algal mats being trapped by the lake circulation patterns. A statistical test for a spring to late summer difference in the median values of SOD confirmed that SOD in the late summer (median value 1.7 g/m2/day) was significantly higher than in the spring (median value 1.2 g/m2/day). The difference was primarily due to seasonal changes in temperature; when SOD values were corrected to 20°C, there was no seasonal difference in the median values. There was no correlation between SOD20 and the sediment characteristics measured in this study: percent fines, organic carbon, and residue lost on ignition. Close

• 98. [Image] Recent paleolimnology of Upper Klamath Lake, Oregon

  	Recent Paleolimnology of Upper Klamath Lake Eilers et al. 2001 ABSTRACT Sediment cores were collected from Upper Klamath Lake in October, 1998 and analyzed for 210Pb, 14C, 15N, N, P, C, Ti, Al, diatoms, ...
  	Citation × Citation Citation Abstract Copy Title: Recent paleolimnology of Upper Klamath Lake, Oregon Author: United States. Bureau of Reclamation Year: 2001, 2005 Recent Paleolimnology of Upper Klamath Lake Eilers et al. 2001 ABSTRACT Sediment cores were collected from Upper Klamath Lake in October, 1998 and analyzed for 210Pb, 14C, 15N, N, P, C, Ti, Al, diatoms, Pediastrum, and cyanobacterial akinetes. These results were used to reconstruct changes in water quality in Upper Klamath Lake over the last 150 years. The results showed that there was substantial mixing of the upper 10 cm of sediment, representing the previous 20 to 30 years. However, below that, 210Pb activity declined monotonically, allowing reasonable dating for the period from about 1850 to 1970. The sediment accumulation rates (SAR) showed a substantial increase in the 20th century. The increase in SAR corresponded with increases in erosional input from the watershed as represented by the increases in sediment concentrations of Ti and Al. The upper 20 cm of sediment (representing the last 150 years) also showed increases in C, N, P, and 15N. The increases in nutrient concentrations may be affected to various degrees by diagenetic reactions within the sediments, although the changes in concentrations also were marked by changes in the N:P ratio and in a qualitative change in the source of N as reflected in increasing S15N. The diatoms showed modest changes, particularly in the upper sediments, with increases in Asterionellaformosa, Stephanodiscus hantzschii, and S. parvus. Pediastrum, a green alga, was well-preserved in the sediments and exhibited a sharp decline in relative abundance in the upper sediments. Total cyanobacteria, as represented by preserved akinetes, exhibited only minor changes in the last 1000 years. However, a taxon which was formerly not present in the lake 150 years ago, Aphanizomenon, has shown major increases in recent decades. Although the mixing in the upper sediments prevents high-resolution temporal analysis of the recent history (e.g. last 30 years) of Upper Klamath Lake, the results demonstrate that major changes in water quality likely have occurred leading to a major modification of the phytoplankton assemblage. The changes in sediment composition are consistent with land use activities during this period that include substantial deforestation, drainage of wetlands, and agricultural activities associated with livestock and irrigated cropland. Title: Recent paleolimnology of Upper Klamath Lake, Oregon Author: United States. Bureau of Reclamation Year: 2001, 2005 Recent Paleolimnology of Upper Klamath Lake Eilers et al. 2001 ABSTRACT Sediment cores were collected from Upper Klamath Lake in October, 1998 and analyzed for 210Pb, 14C, 15N, N, P, C, Ti, Al, diatoms, Pediastrum, and cyanobacterial akinetes. These results were used to reconstruct changes in water quality in Upper Klamath Lake over the last 150 years. The results showed that there was substantial mixing of the upper 10 cm of sediment, representing the previous 20 to 30 years. However, below that, 210Pb activity declined monotonically, allowing reasonable dating for the period from about 1850 to 1970. The sediment accumulation rates (SAR) showed a substantial increase in the 20th century. The increase in SAR corresponded with increases in erosional input from the watershed as represented by the increases in sediment concentrations of Ti and Al. The upper 20 cm of sediment (representing the last 150 years) also showed increases in C, N, P, and 15N. The increases in nutrient concentrations may be affected to various degrees by diagenetic reactions within the sediments, although the changes in concentrations also were marked by changes in the N:P ratio and in a qualitative change in the source of N as reflected in increasing S15N. The diatoms showed modest changes, particularly in the upper sediments, with increases in Asterionellaformosa, Stephanodiscus hantzschii, and S. parvus. Pediastrum, a green alga, was well-preserved in the sediments and exhibited a sharp decline in relative abundance in the upper sediments. Total cyanobacteria, as represented by preserved akinetes, exhibited only minor changes in the last 1000 years. However, a taxon which was formerly not present in the lake 150 years ago, Aphanizomenon, has shown major increases in recent decades. Although the mixing in the upper sediments prevents high-resolution temporal analysis of the recent history (e.g. last 30 years) of Upper Klamath Lake, the results demonstrate that major changes in water quality likely have occurred leading to a major modification of the phytoplankton assemblage. The changes in sediment composition are consistent with land use activities during this period that include substantial deforestation, drainage of wetlands, and agricultural activities associated with livestock and irrigated cropland. Close

• 99. [Image] Trinity River Flow Evaluation: final report: a report to the Secretary , U.S. Department of the Interior

  	TRINITY RIVER FLOW EVALUATION - FINAL REPORT EXECUTIVE SUMMARY When Congress authorized construction of the Trinity River Division (TRD) of the Central Valley Project (CVP) in 1955, the expectation was ...
  	Citation × Citation Citation Abstract Copy Title: Trinity River Flow Evaluation: final report: a report to the Secretary , U.S. Department of the Interior Author: U.S. Fish and Wildlife Service; Arcata Fish and Wildlife Office; Hoopa Valley Tribe Year: 1999, 2006, 2005 TRINITY RIVER FLOW EVALUATION - FINAL REPORT EXECUTIVE SUMMARY When Congress authorized construction of the Trinity River Division (TRD) of the Central Valley Project (CVP) in 1955, the expectation was that surplus water could be exported to the Central Valley without harm to the fish and wildlife resources of the Trinity River. The TRD began operations in 1963, diverting up to 90 percent of the Trinity River's average annual yield at Lewiston, California. Access to 109 river miles of fish habitat and replenishment of coarse sediment from upstream river segments were permanently eliminated by Lewiston and Trinity Dams. Within a decade of completing the TRD, the adverse biological and geomorphic responses to TRD operations were obvious. Riverine habitats below Lewiston Dam degraded and salmon and steelhead populations noticeably declined. In 1981, the Secretary of the Interior (Secretary) directed that a Trinity River Flow Evaluation (TRFE) study be conducted to determine how to rest Title: Trinity River Flow Evaluation: final report: a report to the Secretary , U.S. Department of the Interior Author: U.S. Fish and Wildlife Service; Arcata Fish and Wildlife Office; Hoopa Valley Tribe Year: 1999, 2006, 2005 TRINITY RIVER FLOW EVALUATION - FINAL REPORT EXECUTIVE SUMMARY When Congress authorized construction of the Trinity River Division (TRD) of the Central Valley Project (CVP) in 1955, the expectation was that surplus water could be exported to the Central Valley without harm to the fish and wildlife resources of the Trinity River. The TRD began operations in 1963, diverting up to 90 percent of the Trinity River's average annual yield at Lewiston, California. Access to 109 river miles of fish habitat and replenishment of coarse sediment from upstream river segments were permanently eliminated by Lewiston and Trinity Dams. Within a decade of completing the TRD, the adverse biological and geomorphic responses to TRD operations were obvious. Riverine habitats below Lewiston Dam degraded and salmon and steelhead populations noticeably declined. In 1981, the Secretary of the Interior (Secretary) directed that a Trinity River Flow Evaluation (TRFE) study be conducted to determine how to rest Close

• 100. [Image] The Water Report. Klamath Fishery Science: Controversy in the Klamath River Basin

  	Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. Includes bibliographic references. See the full report at http://www.thewaterreport.com/.
  	Citation × Citation Citation Abstract Copy Title: The Water Report. Klamath Fishery Science: Controversy in the Klamath River Basin Author: Envirotech Publications Year: 2005, 2008, 2006 Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. Includes bibliographic references. See the full report at http://www.thewaterreport.com/. Title: The Water Report. Klamath Fishery Science: Controversy in the Klamath River Basin Author: Envirotech Publications Year: 2005, 2008, 2006 Only portions of issues of The Water Report are available in the Klamath Waters Digital Library. Includes bibliographic references. See the full report at http://www.thewaterreport.com/. Close