Hoover dam,built in the Colarado river on Arizona-Nevada boarder, is a masterpiece of extreme engineering. It houses a hydro-electric power generating station. The picture shows the water draining back into the river after flowing through the mega-tubines generating electricity. A nice place to visit on your Las-Vegas vacation besides the vegas strip....

Intake towers (top)--through which water is pumped into the turbines. Dam crest(bottom)-- provides required elevation for water to run through the turbines at a great speed