Oahe Dam Oahe Dam The Oahe Dam is a large earthen dam on the Missouri River, just north of Pierre, South Dakota, United States. The dam creates Lake Oahe, the fourth largest man-made reservoir in the United States. The reservoir stretches up the course of the Missouri to Bismarck, North Dakota. The dam's power plant provides electricity for much of the north-central United States. It is named for the Oahe Indian Mission established among the Lakota Sioux in 1874. The project provides flood control, Hydropower generation, irrigation, and navigation benefits. Oahe Dam is one of six Missouri River mainstem dams, the next
Westville Dam Westville Dam The Westville Dam is located on the Quinebaug River between Southbridge and Sturbridge, about west of the Southbridge town center and southwest of Worcester, Massachusetts. Designed and constructed by the United States Army Corps of Engineers, this dam substantially reduces flooding along the Quinebaug and Thames rivers. Construction of the project began in June 1960 with completion in August 1962 at a cost of US$5.6 million. The Westville reservoir is located within the Quinebaug River Watershed and is part of the Thames River Basin. Access to the site is available from Interstate 84 and State Route 131. The