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
Grishk Dam Grishk Dam The Grishk Dam is a dam and power plant on the Helmand River, located in Helmand Province, Afghanistan. It was built by the United States in 1945 for the Helmand Valley Authority for hydroelectric power. The dam is an example of one of the 20th century projects to modernize Afghanistan. A 2003 technical journal noted that the Grishk power plant was commissioned on an irrigation canal in 1945, and had two damaged and obsolete 1.2 megawatt units which would cost US$3 million to repair. In 2005, a group of twenty Taliban fighters were captured by a joint US-Afghan