Fort Gibson Dam, Gravity dam near Fort Gibson, United States.

Fort Gibson Dam is a gravity dam built across the Grand River in Oklahoma, equipped with spillway gates and four turbines. It holds back water to form Fort Gibson Lake, which serves communities in northeastern Oklahoma with water supply and hydroelectric power.

Congress authorized the project in the Flood Control Act of 1941, and work began in 1942. The U.S. Army Corps of Engineers seized the construction rights from the Grand River Dam Authority in 1946, the year building resumed after the wartime halt. The river was closed in June 1949, and the project was finished in September 1953 when the fourth generator came online.

The U.S. Army Corps of Engineers seized the project rights from the Grand River Dam Authority in 1946, and the dam's four generators were all running by September 1953. The reservoir, Fort Gibson Lake, lies about 9 km north of the town of Fort Gibson and is used for flood control, hydropower, drinking water and recreation.

Fort Gibson Dam stands on the Grand (Neosho) River about 9 km north of the town of Fort Gibson, reached from Oklahoma. The crest carries a safety railing along its whole length, and the powerhouse end holds a metal tower and electrical equipment on a paved area. The dam is a working U.S. Army Corps of Engineers flood-control and hydropower structure, so the spillway and outlet areas are not open to visitors.

The dam's four generators were the last piece of the project: the river was closed in June 1949, but the plant only reached full operation in September 1953 when the final generator started. Rights to build the dam first belonged to the Grand River Dam Authority and were taken over by the U.S. Army Corps of Engineers in 1946.