IDAHO (Cont.) 



Department of Public Health 



1. Investigation of the Pollution of the Clearwater and Lower Snake Rivers, and of 

 Anadromous Fish Migration in the Clearwater River. 



The objective is to determine the effects of industrial and domestic pollution on the 

 waters of the Clearwater and Lower Snake Rivers. Physical, chemical, bio- 

 chemical, and biological samples have been collected and analyzed, and the 

 results have been correlated with the studies of the wastes from the cities of 

 Lewiston, Idaho, and Clarkston, Washington, and from the Kraft pulp mill of the 

 Potlatch Forests, Inc. , at Lewiston. At the same time these investigations have 

 been underway, there have been daily counts made of passage of salmon and steel- 

 head trout over the fishways at the dam of the Washington Water Power Company 

 near Lewiston. 



From Spalding, Idaho, on the Clearwater River to the Snake River at Lewiston and 

 Clarkston, and the Snake River one-half mile above Lewiston to a point several 

 miles below Clarkston; Department of Fish and Game Cooperating; began August 

 1950, indeifinite; Aleck Alexander, Proj. Ldr. , Idaho Dept. of Health; Leon Murphy, 

 Proj. Ldr. , Fish and Game Dept. 



Address correspondence to: Idaho Dept. of Health, Box 640, Boise, Idaho. 



University of Idaho 



1. A Lin^nological Survey of Pend Oreille Lake, Idaho, with Special Consideration of 

 the Food Habits of the Kokanee. 



Two major power dams, now under construction on the major inlet and outlet of 



Pend Oreille Lake, will block completely fish passage into and out of the lake and 

 will cause great seasonal fluctuations in water level. This project is an atte.-npt 

 to evaluate the effects of these structures on certain limnological features of the 

 lake and particularly on the food supply and habits of the kokanee. The first phase 

 of the study is concerned with conditions existing prior to completion of the dams. 



Idaho Fish and Game Dept. (FA: F-3-R) cooperating; began June 1952, planned for 



2 years; $3,000; Raymond G. Stross, Graduate Student. 

 Address correspondence to: Virgil S. Pratt, Wildlife Research Unit, Forestry Bldg. , 



Univ. of Idaho, Moscow, Idaho. 



2. Age, Growth and Migration of the Steelhead Trout in the Clearwater River. 



This is a cooperative study of certain life history phases of an important Idaho game 

 fish. Present work is restricted to collection and analyses of length, weight 

 measurements, scales and tagging data from adult steelheads on their spawning 

 migration. 



Washington Water Power Dam on the Clearwater River, Lewiston; Idaho Fish and Game 

 Dept. cooperating; began January 1952, planned for 1 year, 9 months; $2,000; 

 Charles Whitt, Graduate Student. 



Address correspondence to: Virgil S. Pratt, Wildlife Research Unit, Forestry Bldg. , 

 Univ. of Idaho, Moscow, Idaho. 



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