Northwest Fisheries Science Center

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Document Type: Contract Report
Center: NWFSC
Document ID: 7260
Title: Migrational characteristics of juvenile salmonids in the mid-Columbia River during 1976
Author/Editor: Carl W. Sims, David R. Miller
Publication Year: 1977
Publisher: National Marine Fisheries Service
Contracting Agency: Chelan, Douglas, and Grant County Public Utility Districts
Date: 1977

The development of the mid–Columbia River for hydroelectric production has adversely affected the runs of salmon and steelhead in the area.  Priest Rapids, Wanapum, and Rocky Reach Dams, completed in the early 1960s, and Wells Dam, completed in 1967, have created barriers which fish must negotiate.  Since 1972, regulation of the river through use of Canadian storage reservoirs has significantly altered the natural flow patterns of the river and reduced river flows and spill at dams during the major juvenile outmigration.  Since 1964, daily peaking for power production has affected the portion of the juvenile migration which occurs in July and August, and since 1972 peaking has also affected juvenile migrations that occur in the spring.