IDAHO (Cont. ) 



the principal inlet of the lake. Fluctuation of the lake elevation and inlet flow 

 during kokanee and dolly varden spawning presents a serious problenn to the nnain- 

 tenance of populations of these species. 



U. S. Arnny Corps of Engineers and Washington Water Power Company 

 cooperating; Bonner and Kootenai Counties; began February 1951, planned for 

 4 years; $14,000; Paul Jeppson, Leader; reports available. 



Address correspondence to: James C. Simpson, Chief, Fisheries Division, 

 Idaho Fish and Game Department, 518 Front Street, Boise, Idaho 



2. Effects of Hydroelectric Developments on the Fishery Resources of Snake River. 

 (FA: F-8-R) 



The study is designed to evaluate the fluctuating impoundnnents and river 

 flows above and below a series of five hydroelectric dams on Snake River in 

 southwestern Idaho and, particularly, as they affect the sport fishery of this 

 water. Physical and biological studies and creel census are being used. 



From backwaters of Upper Salmon Falls impoundment near Hagerman to 

 just below Swan Falls dam; began July 1952, to close March 1955; $9, 000; Robert 

 Irving, Leader; reports available. 



Address inquiries to: James C. Simpson, as in No. 1 above. 



3. Fisheries Investigations on Bear Lake. (FA: F-IO-R) 



This study is designed to deternnine suitable management policies for the 

 sport fishery of Bear Lake. Mackinaw, rainbow and cutthroat trout and several 

 species of whitefish are involved. Limnological studies and creel census are 

 being employed. 



Utah Fish and Game Department, Utah Cooperative Wildlife Research Unit, 

 and U. S. Fish and Wildlife Service cooperating; southeastern Idaho and northern 

 Utah; began January 1, 1953, to close December 31, 1955; $5,000; William J. Clark, 

 Leader; reports available. 



Address inquiries to: James C. Simpson, as in No. 1 above. 



4. Rehabilitation of Roseworth Reservoir. (FA: F-ll-D) 



This is a development project aimed at the re-establishment of a rainbow 

 trout sport fishery in a 1200-acre irrigation impoundment. The reservoir was 

 treated with rotenone in September 1953, and will be restocked during the spring 

 of 1954. 



Twin Falls County; began August 1, 1953, to close July 31, 1954; $12, 700; 

 Robert B. Irving, Leader. 



Address inquiries to: James C. Simpson, as in No. 1 above. 



5. Fisheries Investigations of Henrys Lake. (FA: F-13-R) 



This study is designed to implement past studies on Henrys Lake in order 

 to determine the decline in population of adult cutthroat trout, and the need for 

 regulating the popular sport fishery on this water. 



Fremont County; began March 1, 1954, to close June 30, 1956; $7,100; 

 Donald Andriano, Leader. 



Address inquiries to: James C. Simpson, as in No. 1 above. 



6. Utilization of Idaho Waters by Spring Chinook Salmon. (FA: F-l-R)* 



A survey is being made of the extent of use by salmon, the number of salmon 

 utilizing each stream studied, and the harvest by fishermen. 



Tributaries of the Salmon River; began July 1951, to close June 30, 1954; 

 $4, 800; Forrest R. Hauck, Leader. 



Address inquiries to: James C. Sinnpson, as in No. 1 above. 



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