Lake Oahe Lake Oahe Lake Oahe (oh-WAH'-hee) is a large reservoir behind Oahe Dam on the Missouri River; it begins in central South Dakota and continues north into North Dakota in the United States. The lake has an area of and a maximum depth of . By volume, it is the fourth-largest reservoir in the US. Lake Oahe has a length of approximately and has a shoreline of . 51 recreation areas are located along Lake Oahe, and 1.5 million people visit the reservoir every year. The lake is named for the 1874 Oahe Indian Mission. Lake Oahe begins just north of
East Brimfield Dam East Brimfield Dam The East Brimfield Dam is located on the Quinebaug River in Sturbridge, Massachusetts, approximately 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 1958 with completion in 1960 at a cost of US$7,020,000. The East Brimfield Reservoir, located in Sturbridge and Brimfield to its west, lies within the Quinebaug River Watershed and is part of the Thames River Basin. Access to the site is available from US Route 20. The project consists of a