Dam of its scale had ever been attempted; on completion, it was the largest masonry dam in the world. The Hoover Dam is a massive concrete arch-gravity dam, constructed in the Black Canyon of the Colorado River, on the border between the US states of Arizona and Nevada between 1931 and 1936 during the Great Depression. In 1928, Congress authorized the project to build a dam that would control floods, provide irrigation water and produce hydroelectric power. The winning bid to build the dam was submitted by a consortium called Six Companies, Inc. Such a large concrete structure had never been
Steamboats of the Colorado River California, about 40 miles north of Goffs station, on the Santa Fé Railway. A mining camp, Vanderbilt was established nearby Vanderbilt Spring. The discovery of additional gold-rich veins in the fall of 1892 set off a rush to the area. A few months later gold was found at what became the placer mining camp of Murphyville, on the Arizona side of the river just twelve miles below Eldorado Canyon. Also in 1892, another gold boom occurred twenty miles east of Eldorado Canyon at White Hills in the White Hills, in Arizona Territory. Gold mines were revived in the Picacho District