Hoover Dam sits in the Black Canyon on the Colorado, the concrete arc between Lake Mead and the river below. From a helicopter out of Las Vegas it is a waypoint on the way to Grand Canyon West: the dam, the bypass bridge, and the lake in one look.
You see it from the air on this 45-minute outbound flight. It is not a landing. The helicopter continues to the west rim; the dam is the first big mark after leaving the valley.