Straddling the Nebraska/South Dakota border, Gavins Point Dam, SD is the smallest of the six Missouri River main stem dams and the southernmost dam on the river. Lewis and Clark Lake, named for the first documented explorers of the Louisiana Territory, is 25 miles long, has 90 miles of shoreline, and 27 recreation areas offering camping, picnicking, fishing, hunting, boating, water-skiing, swimming, bird-watching, hiking, photography, and biking opportunities.