Williams and Matthews: Flow and survival relationships for Oncorhynchus tshawytscha 



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MONTANA 



Figure 1 



Map of the Columbia River Basin. 



on the middle Snake River (Hells Canyon area) in 

 1958 and in anticipation of low-head dams autho- 

 rized, but not yet constructed, for the lower Snake 

 River (the stretch from its confluence with the Co- 

 lumbia River upstream to the confluence of the 

 Clearwater River). As part of these efforts, one group 

 of researchers from the Bureau of Commercial Fish- 

 eries (now the National Marine Fisheries Service 

 [NMFS]) began studies with juvenile chinook salmon 

 from the Snake River Basin to determine migration 

 rates in relation to flow through areas of impounded 

 and unimpounded stretches of the Snake and Colum- 

 bia Rivers (Raymond, 1968). As the Lower Snake 

 River dams and John Day Dam on the Lower Co- 

 lumbia River were completed, NMFS expanded these 

 studies to estimate, in addition, the survival of fish 

 passing through these impoundments. Raymond 

 ( 1979) summarized the results of research from 1964 

 through 1975; results from 1976 through 1983 were 

 detailed in a number of unpublished contract reports 

 to the U.S. Army Corps of Engineers (COE). 2 



2 Sims, C. W., W. W. Berkley, and R. C. Johnsen. 1977. Effects 

 of power peaking operations on juvenile salmon and steelhead 

 trout migrations — progress 1976. Report to U.S. Army Corps 



2 (Continued) of Engineering, Portland, OR, 44 p. Northwest 



Fish. Sci. Cent., NMFS. 



Sims, C. W., W. W. Bentley, and R. C. Johnsen. 1978. Effects of 

 power peaking operations on juvenile salmon and steelhead trout 

 migrations — progress 1977. Report to U.S. Army Corps of En- 

 gineering, Portland, OR, 52 p. Northwest Fish. Sci. Cent., 

 NMFS. 



Raymond, H. L., and C. W. Sims. 1980. Assessment of smolt 

 migration and passage enhancement studies for 1979. Re- 

 port to U.S. Army Corps of Engineering, Portland, OR, 48 

 p. Northwest Fish. Sci. Cent., NMFS. 



Sims, C. W., J. G. Williams, D. A. Faurot, R. C. Johnsen, and 

 D. A. Brege. 1981. Migrational characteristics of juvenile 

 salmon and steelhead in the Columbia River Basin and re- 

 lated passage research at John Day Dam. Report to U.S. 

 Army Corps of Engineering, Portland, OR, 61 p. Northwest 

 Fish. Sci. Cent., NMFS. 



Sims, C. W., R. C. Johnsen, and D. A. Brege. 1982. Migra- 

 tional characteristics of juvenile salmon and steelhead in the 

 Columbia River System — 1981. Report to U.S. Army Corps 

 of Engineering, Portland, OR, 16 p. Northwest Fish. Sci. 

 Cent., NMFS. 



Sims, C. W., A. E. Giorgi, R. C. Johnsen, and D. A. Brege. 

 1983. Migrational characteristics of juvenile salmon and steel- 

 head in the Columbia River Basin — 1982. Report to U.S. Army 

 Corps of Engineering, Portland, OR, 35 p. Northwest Fish. 

 Sci. Cent., NMFS. 



Sims, C. W., A. E. Giorgi, R. C. Johnsen, and D. A. Brege. 1984. 

 Migrational characteristics of juvenile salmon and steelhead in 

 the Columbia River Basin — 1983. Report to U.S. Army Corps 

 of Engineering, Portland, OR, 31 p. Northwest Fish. Sci. Cent., 

 NMFS. 



