Major John Wesley Powell makes the first recorded trip through the Grand ... Boulder Canyon Project Act. The Bureau of Reclamation opens bids for the construction of Boulder (Hoover) Dam and ...

but afterwards officially designated the Hoover Dam, across the Colorado River in Black Canyon, which forms the boundary between the States of Arizona and Nevada, at a point about twenty-five ...

A variety of companies offer helicopter tours of the Grand Canyon, with many options departing from Grand Canyon National Park Airport (located in ... the Hoover Dam and more before stopping ...

Saturday commemorates the 89th anniversary of the Hoover Dam's completed construction, considered by most experts "a modern miracle" and one of the most visited sites in the world. The 726-foot ...