Assessment of Probable Fishery Impacts of Hydroelectric Development at Lock and Dam No. 26 (Replacement), Mississippi River

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by Thomas M. Keevin, Univ of Illinois at, Urbana-Champaign, Urbana, IL, USA,
Jamie E. Thomerson, Univ of Illinois at, Urbana-Champaign, Urbana, IL, USA,

Document Type: Proceeding Paper

Part of: Waterpower '85

Abstract: Early coordination with affected Federal and state agencies allowed completion of an Environmental Assessment for a hydroelectric plant proposed for Lock and Dam No. 26 (Replacement). Available hydrologic data were compared including period of record (1938-1980) tailwater stages; projected percentage of flow through navigation locks, dam gates, and turbines; There would be minimum turbine operation during major periods of fish movement or larval drift. Existing velocities through the dam gates preclude upstream fish migrations except during extreme high water stages when the turbine units would be shut down. Downstream larval drift would usually occur when the turbines are shut down, or when a large percentage of water is passed through the dam gates. Turbine transit mortality for small fishes is expected to be low.

Subject Headings: Locks (dam) | Fish management | Rivers and streams | Hydro power | Locks (waterway) | Turbines | Gates (hydraulic) | Hydrologic data | Mississippi River

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