Water Management for Juvenile Fish Passageby Malcolm H. Karr, Columbia Basin Tribes Fish Passage, Cent, Portland, OR, USA,
Abstract: The regional goal of restoring upriver runs of adult salmon and steelhead requires increased survival of the juvenile fish migrating to the ocean. Juvenile fish survival requires: (1) conditions which allow the fish to move as rapidly as possible from freshwater rearing areas to saltwater; and (2) means to bypass the fish at dams without passing through turbines. A volume of water called the Water Budget, allocated from the federal hydropower storage system, is jointly managed by the Columbia Basin fish and wildlife agencies and Indian tribes to increase flow through the reservoirs during the spring outmigration and thereby reduce juvenile fish travel time. Survival of juvenile fish passing dams is being increased by a combination of collection and transport systems, a variety of bypass facilities, and the use of spill where collections and/or bypass facilities are lacking or inadequate. The fish and wildlife agencies and tribes also develop and implement spill criteria, and evaluate juvenile fish travel time and survival resulting from Water Budget and spill implementation.
Subject Headings: Fish management | Hydro power | Travel time | Water storage | Budgets | Water resources | Dams | Basins
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