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
Norris Dam State Park the Tennessee Valley Authority in the early 1930s. The Clinch River flows southwestward for from its source in southwestern Virginia to its mouth along the Tennessee River near Kingston. Norris Dam is located just over upstream from the mouth of the Clinch, near the Anderson-Campbell county line. Cove Creek, which flows down from its source in the Cumberland Mountains roughly to the northwest, empties into the Clinch approximately north of Norris Dam. The Powell River, which also rises in southwestern Virginia, empties into the Clinch approximately upstream from Norris Dam. Norris Lake spans a stretch of the Clinch from the