It was built to generate power for areas around it.

It is 1,244 feet (379 meters) long and 726 Feet(13,7 meter)

Yes it is manmade.

It is located in Nevada, on the border of Arizona.

Before it was the Dam it was a canyon.

After the water was moved , there was a thick layer of mud on the floor of the dam site. The workers removed the mud until they reached a surface called bedrock.

For thousands of years, the Colorado River helped the lives of people, plants, and animals that lived near it. But the river was dangerous. Some times it flooded. So they decided to build a dam.