To divert the Colorado River's flow around the Hoover Dam construction site, four 56-foot-diameter tunnels were driven through the walls of Black Canyon, two on the Nevada side and two on the Arizona side.

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. Constructed between 1931 and 1936, during the Great Depression, it was dedicated on September 30, …

Mar 12, 2015 · The river was diverted around the dam site through four 50-foot-diameter tunnels, two drilled through the canyon walls on each side of the river. The tunnels, with a total combined length of 15,946 feet, or about three miles, were excavated to 56 feet and lined with three feet (300,000 cubic yards) of concrete.

Visit the Historic Railroad Tunnel Trail to access the original 300 foot long tunnels carved out of the Nevada mountainside to transport building materials to the Hoover Dam in the 1930s. The Historic Railroad Trail is one not to be missed when visiting Lake Mead and Hoover Dam area.

Early construction tunnels at Hoover Dam. Bureau of Reclamation . Before construction began, the mighty Colorado had to be diverted so workers could have access to a dry river bed. Four tunnels were driven through the canyon walls, two on …

Nov 6, 2024 · Explore the history of Hoover Dam at the Old Historic Railroad Tunnel Trail. Walk through five mountain tunnels and enjoy panoramic views of Lake Mead.

The most dangerous phase of Hoover Dam's construction was building the diversion tunnels, two on each side of the Colorado River. Blasting holes 56 feet in diameter, three-quarters of a...

5 days ago · Persons with Claustrophobia: Be advised tours include elevator rides and walking through tunnels. Click on image or link for large pdf version of map. Most passenger vehicles can cross the dam. All vehicles are subject to inspection at the Nevada Security Checkpoint.

With its 110-mile-long Lake Mead, Hoover Dam and its corresponding system of tunnels, outlet works, spillways, powerplant, and transmission lines has transformed this bone-dry slice of desert into a vacation paradise.

Jan 21, 2017 · Hoover Dam Tunnels. In April 1931 blasting for construction of plain dry area, upon which dam would be built, began.To divert the Colorado river 4 tunnels were to be excavated on each side of the Canyon, measuring 4000 ft long and the diameter of the tunnel was 56 ft, these were acting as diversion channels.