U.S. Department of Defense



Date of this Version



Published by the U.S. Army Corps of Engineers (1977) 1-121


This study investigated a wide range of water resource problems and opportunities related to the Missouri River and the six main stem dams along an area extending over 1.500 miles from Sioux City. Iowa to Three Forks. Montana. Subjects of the study were: the feasibility of installing additional hydro-power generating units both at the main stem dams and adjacent to the river; resolution of bank erosion, waterlogging, and residual flood problems; opportunities for recreation, fish and wildlife enhancement; operating plans of the main stem system considering future water use; and potential for extending navigation upstream from Sioux City. Iowa.

Several elements were dropped during the course of the study. Water allocation and marketing was an initial objective; however, basin states indicated such studies to be untimely. This report, therefore, does not make any recommendations dealing with priorities of water use. Surface inundation and waterlogging along a 10-mile reach upstream from the mouth of the Niobrara River during periods of high release from Fort Randall have been judicially determined to require Federal compensation of the landowners. A separate report will deal with this problem. In response to the waterlogging problem at Suford-Trenton, North Dakota, the Corps has developed a
drainage plan to be accomplished under existing authority. Extension of navigation past the main stem dams or only as far as Yankton, South Dakota, is clearly infeasible even under the most favorable aasumptions. Potential hydro-power additions at the Oahe and Fort Randall damsites and a pumped-storage facility at Garrison have been deferred for future evaluation.