Oahe Dam dam upstream is Garrison Dam, near Riverdale, North Dakota, and the next dam downstream is Big Bend Dam, near Fort Thompson, South Dakota. In September and October 1804, the Lewis and Clark Expedition passed through what is now Lake Oahe while exploring the Missouri River. Oahe Dam was authorized by the Flood Control Act of 1944, and construction by the United States Army Corps of Engineers began in 1948. The world’s first rock tunnel boring machine (TBM) was invented in 1952 by James S. Robbins for the Oahe Dam project, which marked the beginning of machines replacing human tunnelers. The
Hiwassee Dam bend in the river known as Fowler Bend. The dam is upstream from Apalachia Dam (which is near the Tennessee-North Carolina state line) and downstream from Chatuge Dam. Hiwassee Dam and its reservoir are surrounded by the Nantahala National Forest. Hiwassee Village, a small community that developed alongside the dam and reservoir, is located immediately south of Hiwassee Dam. North Carolina State Highway 1314 (Hiwassee Dam Access Road) crosses the top of the dam. Hiwassee Dam is a concrete gravity overflow dam high and long, and has a generating capacity of 185,000 kilowatts. The dam's spillway is controlled by seven