Lake Oahe is a large reservoir behind the 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 370,000 acres and a maximum depth of 205 ft. By volume, it is the fourth-largest reservoir in the US. Lake Oahe has a length of approximately 231 mi and has a shor…Lake Oahe is a large reservoir behind the 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 370,000 acres and a maximum depth of 205 ft. By volume, it is the fourth-largest reservoir in the US. Lake Oahe has a length of approximately 231 mi and has a shoreline of 2,250 mi. 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.
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