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
Beaver Dam State Park (Nevada) dam in 1961. After Schroeder Lake was washed out by flood in 2005, the reservoir was not rebuilt. In 2009, the reservoir was drained and Beaver Dam Wash was restored to its natural state. The park has picnicking facilities, campgrounds, trout fishing in beaver ponds and streams, and hiking trails. The Overlook Trail offers a 360° view of the park. Beaver Dam State Park (Nevada) Beaver Dam State Park is a public recreation area encompassing more than along Beaver Dam Wash in Lincoln County, Nevada. The state park is on the Nevada/Utah state line about east of the town of