These are the power houses. There are two that supply electricty to the southern United States, not all of it obviously.
This is the lake side of the dam. The water level is pretty low, the lowest it's been in years. This picture was taken from the road on top of the dam. The water level has been right up to the rocks at the bottom of the picture in years past. From the picture, the power houses are behind and to the left and the town of Fort Peck is right behind.