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Seminoe Dam was completed April 1, 1939. The dam is a concrete arch construction 295 feet high, 530 feet long, 15 feet wide at the top, and 85 feet wide at the bottom. This structure contains over 1 million acre-feet of water supplied by the North Platte and Medicine Bow rivers. The Seminoe Mountains surrounding the reservoir and state park were prospected for gold in the 1800's.