![]() ![]() ![]() Millions of tons of loose sediment and rocks were scraped away to reveal bedrock. Three miles of diversion tunnels were dug on both sides of the river, and huge berms or “cofferdams' were built above and below the site.With the riverbed dry, excavation began. The first step: diverting the river away from the construction site. ![]() At its peak, the project employed 5,251 people. They had initially chosen Boulder Canyon (unfortunately located on a seismic fault line), which gave the project its first name, Boulder Dam.Congress authorized the project in 1928 construction began in 1931, under the direction of a consortium called Six Companies, Incorporated.The Great Depression was in full swing, and tens of thousands of hopeful workers flocked to the dam site with their families, camping out in temperatures that reached 120 degrees Fahrenheit. Reclamation Service settled on Black Canyon as the ideal location for a dam. Simultaneously, a series of catastrophic floods made it clear that the Colorado River needed to be dammed and controlled.In 1922, the U.S. You may have to select a menu option or click a button.In the early years of the 20th century, the rapid development of the southwestern United States was creating a high demand for electricity and water. Follow the instructions for disabling the ad blocker on the site you’re viewing.You may have more than one ad-blocker installed. You’ll usually find this icon in the upper right-hand corner of your screen. Click the icon of the ad-blocker extension installed on your browser.When it turns gray, click the refresh icon that has appeared next to it or click the button below to continue.Click on the large blue power icon at the top. ![]() Click the UBlock Origin icon in the browser extension area in the upper right-hand corner.It will turn gray and the text above will go from “ON” to “ OFF”. Click on the “ Ad-Blocking” button at the bottom.Click the Ghostery icon in the browser extension area in the upper right-hand corner.Switch off the toggle to turn it from “ Enabled on this site” to “ Disabled on this site”.Click the AdBlocker Ultimate icon in the browser extension area in the upper right-hand corner.“ Block ads on – This website” switch off the toggle to turn it from blue to gray.Click the AdBlock Plus icon in the browser extension area in the upper right-hand corner.Refresh the page or click the button below to continue.Under “ Pause on this site” click “ Always”.Click the AdBlock icon in the browser extension area in the upper right-hand corner.Adblock Adblock Plus Adblocker Ultimate Ghostery uBlock Origin Others ![]()
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