Clark Gable and Ricardo Montalban in Across the Wide Missouri (1951) #westernmovies | Classic Western Movies

The Lake Francis Case lies along the Missouri River in southern South Dakota, created by the construction of Fort Randall Dam. Like other major reservoirs on the Missouri, it follows the original river valley, forming long, winding arms that flood former plains and tributaries. What was once a moving river corridor is now a broad, controlled body of water stretching across the Great Plains. Geography made this location ideal for large-scale water management. The Missouri River drains vast areas