Accession Number : ADA323308

Title :   Lower Granite Reservoir In-Water Disposal Test: Results of the Fishery, Benthic and Habitat Monitoring Program-Year 4 (1991).

Corporate Author : IDAHO UNIV MOSCOW DEPT OF FISH AND WILDLIFE RESOURCES

Personal Author(s) : Bennett, David H. ; Dresser, Thomas J., Jr. ; Curet, Thomas S. ; Lepla, Kenneth B. ; Madsen, Melissa A.

PDF Url : ADA323308

Report Date : NOV 1993

Pagination or Media Count : 266

Abstract : Completion of the Lower Granite Lock and Dam Project on the Snake River in 1975 provided electrical power production, flood control, navigation and recreation to the eastern Washington-west central Idaho areas. Sediment deposition from upstream sources is jeopardizing many of the legislated uses of this project, as approximately 800,000 cubic yards (611,680 m3) of material deposit annually in the upstream portion of Lower Granite Reservoir. The large quantity of this material has necessitated dredging and consideration of in-water disposal downstream of river mile 120 (RM 120) as a management alternative. Dredging began in 1986 with land disposal and experimental in- water disposal was initiated in 1988. Two in-water disposal sites were examined; in 1988 a mid-depth site originally 20-40 ft (6.1-12.1 m) deep was modified to a depth of 6-12 ft (1.8-3.6 m) thereby creating an underwater plateau, and in 1989 an island was created immediately downstream of the underwater plateau. Monitoring of the fish and benthic communities began in 1988. This report provides information on the results of monitoring changes in the fish community and utilization of these created habitats in year-4 (1991).

Descriptors :   *WATER, *ELECTRIC POWER PRODUCTION, *WASTE DISPOSAL, *FISHERIES, *DREDGING, *FISHES, *FLOOD CONTROL, COMMUNITIES, MONITORING, GRANITE, DEPOSITION, NAVIGATION, HABITATS, RECREATION, LAND AREAS, RESERVOIRS, UNDERWATER, BENTHONIC ZONES, DAMS.

Subject Categories : Biology
      Hydrology, Limnology and Potamology
      Safety Engineering
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE