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, Arizona to Arizona State Route 389 (which is paved) — and even at that, is connected only to the rest of the "Arizona Strip" (that part of Arizona separated from the rest of the state by the Grand Canyon), not to Arizona at large. The Virgin River Gorge is located just to the east of Beaver Dam. The Post Office is located in Beaver Dam on McKnight Boulevard. Fire Station No. 1 is located in Beaver Dam (No. 2 is located in Desert Springs, and No. 3 is located in Scenic). Beaver Dam has a large population of "snowbirds" (retirees from