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
Lake Oahe Dakota were flooded by the Oahe Dam alone. As of 2015, poverty remains a problem for the displaced populations in the Dakotas, who are still seeking compensation for the loss of the towns submerged under Lake Oahe, and the loss of their traditional ways of life. Lake Oahe became a point of contention in protests to block the Dakota Access Pipeline. The construction project has been controversial for its environmental impacts, and several Native American tribes in the Dakotas and Iowa have opposed the project. These include several Sioux nations and the Meskwaki. In 2016 a group from the Standing