Oahe Downstream Recreation Area by Congress transferred ownership of the recreation area to the State of South Dakota in 2002. Oahe Downstream Recreation Area Oahe Downstream Recreation Area is a state recreation area in Stanley County, South Dakota in the United States. The recreation area is named for being immediately downstream of the Oahe Dam and Lake Oahe, a U.S. Army Corps of Engineers dam and reservoir. The recreation area is located along the Missouri River and is popular for camping, fishing and other water-based recreation. The area is located about 7 miles upstream of Pierre - the state capitol. The recreation area was
Folsom Dam project that provides flood control, hydroelectricity, and irrigation and municipal water supply. In order to increase Sacramento's flood protection to 200 year flood protection (meaning that the area is protected from a flood that has a 0.5% chance of occurring in any given year) the US Army Corps of Engineers is constructing an auxiliary spillway. The spillway was completed by October 2017, and enables Folsom Dam to release water before it reaches the height of the gates already in place. Another Central Valley Project dam, Nimbus Dam, is located further down river. Folsom Dam is located just north of the