Garrison Dam, North Dakota

The Garrison Dam Holds back Lake Sakakawea, the third largest man-made lake in the country, and one of several major lakes made by dams along the Missouri River. The dam was constructed by the Army Corps of Engineers, between 1947 and 1953, and it is more than two miles long. Lake Sakakawea flooded several Native American communities, including the town of Elbowoods. 1,700 residents and members of the Three Affiliated Tribes, were relocated to the new town of New Town, from which they watched most of their productive agricultural land disappear under the floodwaters.