Accession Number : ADA322562

Title :   Limnological and Fishery Studies on Lake Sharpe, a Main-Stem Missouri River Reservoir, 1964-1975.

Descriptive Note : Technical rept.,

Corporate Author : FISH AND WILDLIFE SERVICE WASHINGTON DC

Personal Author(s) : June, Fred C. ; Beckman, Lance G. ; Elrod, Joseph H.

PDF Url : ADA322562

Report Date : 1987

Pagination or Media Count : 91

Abstract : Lake Sharpe, the most recent of six main-stem Missouri River reservoirs to be impounded, began to fill in November 1963 and became fully operational in July 1966. At full pool it is 137 km long, and has a surface area of 22,600 ha and a volume of 2.34 km3. It is operated as a flow-through power generation system that reregulates discharges from upstream Lake Oahe. Major changes in the water-management regimen during 1966-75 were increased summer discharges beginning in 1969 and increased peaking operations beginning in 1973. Lake Sharpe had a relatively short aging process because it filled rapidly, the water level remained relatively stable, and the water- exchange rate was high. Consequently, most physical, chemical, and biological characteristics were remarkably uniform during 1966-75. The temperature regimen was largely governed by inflow from Lake Oahe. Although the water mass warmed during summer, thermal stratification was generally transient, limited to the lower reservoir, and more common during periods of relatively low discharge rates in 1966-68 than in later years. Variation in turbidity was striking; the midsection of the reservoir was generally most turbid. Chemical ion composition of the water tended to be uniform; observed differences were localized and associated with tributary inflows. Phytoplankton abundance reached its highest levels during 1970-75. Composition of the zooplankton community changed during 1966-75; the abundance of cyclopoid copepods decreased and that of calanoid copepods and cladocerans increased. Total abundance varied during the 10-year period, but without apparent trend. Variation in abundance appeared to be associated with discharge rate, water temperature, and turbidity.

Descriptors :   *WATER FLOW, *BIOLOGY, *FISHERIES, *AQUATIC ORGANISMS, *RESERVOIRS, *LIMNOLOGY, THERMAL PROPERTIES, TEMPERATURE, COMMUNITIES, AGING(PHYSIOLOGY), CHEMICAL COMPOSITION, SHORT RANGE(TIME), LEVEL(QUANTITY), PATTERNS, STRATIFICATION, LOW RATE, WILDLIFE, LAKES, WATER MASSES, EXCHANGE, SUMMER, STREAMS, ZOOPLANKTON, TURBIDITY, REGIMENT LEVEL ORGANIZATIONS.

Subject Categories : Agronomy, Horticulture and Aquiculture
      Medicine and Medical Research
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE