Us Army Corps of Engineers, South Dakota.
Big Bend Dam, SD takes its name from the unique bend in the Missouri River 7 miles upstream from the dam. At this point in its course, the Missouri makes almost a complete loop, traveling 25 miles before returning to the "neck" where the land is not quite a mile wide. The 19 Lake Sharpe recreation areas vary from primitive to highly developed and provide opportunities for camping, boating, picnicking, and fishing.
From Sioux Falls, west on I-90 to Reliance, then north on SD 47.