The visitor center for Gavins Point Dam is located on Calumet Bluff on the Nebraska side of the river. It is just across the dam from Yankton.
The visitor center offers great views of the power plant and Lewis & Clark Lake. It is a good place to learn about some of the history of the area and get a better understanding of the lake, dam and power plant.
There are even some natural history displays, and discussions of geology.
Visit the Army Corps of Engineers website for hours.