1The Hoover Dam represents an amazing architectural feat of modern times. 2Standing 726 feet high and 1,244 feet wide, it is one of the largest dams in the world. 3The dam, built on the raging Colorado River, stores water in its reservoir, nearby Lake Mead. 4_______ 5Hoover Dam also serves as a powerful hydroelectric generator, turning energy from the river into an important electricity source for the Southwest.