National Geographic : 1948 Dec
816 WiII mIr kn 726-foot Hoover Dam, World's Highest, Plugs the Colorado and Backs Up a Huge Reservoir Lake Mead, in the background, stretches 115 miles and has a maximum depth of 583 feet. Steel skeletons (upper left) are switchyards from which power lines radiate to Nevada and California. The dam's 1,244-foot crest serves as an automobile highway. Until it was built, no wheels rolled across the river between Arizona (near side) and Nevada (page 827).