The Flaming Gorge Dam is a concrete-arch dam on the Green River in Utah, in the United States. Built in 1958-1964, the dam is tall, long, and thick. It is one of the biggest dams in the United States. Its reservoir, the Flaming Gorge Reservoir, is about long, and covers 42,000 acres (170 square kilometers). The dam was built for water storage and hydroelectric power, and it produces about 152 megawatts of electricity.