Hoover Dam the change, stating, "I didn't know Hoover was that small a man to take credit for something he had nothing to do with." Hoover Dam was recognized as a National Civil Engineering Landmark in 1984. It was listed on the National Register of Historic Places in 1981, and was designated a National Historic Landmark in 1985, cited for its engineering innovations. Other sources Hoover Dam Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the
Big Bend of the Colorado State Recreation Area Big Bend of the Colorado State Recreation Area Big Bend of the Colorado State Recreation Area is a public recreation area located in the Lower Colorado River Valley within the city of limits of Laughlin in southern Clark County, Nevada. The park is located directly across the Colorado River from Bullhead City, Arizona, and is approximately downstream of the Davis Dam. The park has two miles of shoreline and riparian areas. The majority of its consists of canyons and washes. The Fort Mohave Land Act of 1960 saw the transfer of of federal land in the Laughlin Big Bend area