Physical and chemical characteristics of Lake Oahe, 1968-69 /

The physical and chemical characteristics presented provide a description of Lake Oahe and establish bases for certain characteristics which may alter as the reservoir ages. Water temperatures were strongly influenced by wind-driven currents and water depth. The duration of thermal stratification varied from about 3 wk in the upstream portion of the reservoir to about 15 wk near the dam in 1968 and from unstratified upstream to about 15 wk downstream in 1969. Dissolved oxygen was usually near saturation, although it fell to 30% in 1968 and 43% in 1969. Nitrate nitrogen and soluble phosphorus were present on all sampling dates in 1969. Silica levels may have become limiting for diatoms in late summer, 1968.Part of "Twelve Papers on Lake Oahe, North and South Dakota".Bound with: Ecological changes during the transitional years of final filling and full impoundment (1966-70) of Lake Oahe, an Upper Missouri River storage reservoir (Technical Paper 71) ; Invertebrate macrobenthos of Lake Oahe, 1968-69 (Technical Paper 73) ; Limnetic crustacean zooplankton of Lake Oahe, 1968-69 (Technical Paper 74) ; Species and age composition of trap net catches in Lake Oahe, South Dakota, 1963-67 (Technical Paper 75) ; Evaluation of trawls for monitoring and harvesting fish populations in Lake Oahe, South Dakota (Technical Paper 76) ; Age, Growth, and maturity of thirteen species of fish from Lake Oahe during the early years of impoundment, 1963-68 (Technical Paper 77) ; Population trends, growth, and movement of bigmouth buffalo, Ictiobus cyrinellus, in Lake Oahe, 1963-70 (Technical Paper 78) ; Goldeye, Hiodon alosoides, in Lake Oahe: Abundance, age growth, maturity, food and the fishery, 1963-69 (Technical Paper 79) ; The commercial fishery in Lake Oahe, North and South Dakota, 1964-70 (Technical Paper 80) ; Age, growth, sexual maturity, and food of channel catfish in Central Lake Oahe, 1968-69 (Technical Paper 81) ; An experimental trap net fishery, Lake Oahe, South Dakota, 1965 (Technical Paper 82).Includes bibliographical references. (p. 17-18).The physical and chemical characteristics presented provide a description of Lake Oahe and establish bases for certain characteristics which may alter as the reservoir ages. Water temperatures were strongly influenced by wind-driven currents and water depth. The duration of thermal stratification varied from about 3 wk in the upstream portion of the reservoir to about 15 wk near the dam in 1968 and from unstratified upstream to about 15 wk downstream in 1969. Dissolved oxygen was usually near saturation, although it fell to 30% in 1968 and 43% in 1969. Nitrate nitrogen and soluble phosphorus were present on all sampling dates in 1969. Silica levels may have become limiting for diatoms in late summer, 1968.Mode of access: Internet