As of 2014, the largest man-made lake in the U.S. is Lake Mead. Lake Mead is located in Arizona and Nevada, as part of the Lake Mead National Recreation Area.
Lake Mead was created, in 1935, with the completion of the Hoover Dam on the Colorado River. The lake holds so much water that it could flood the state of New York with 1 foot of water. Lake Mead has 550 miles of shoreline that is used for a variety of recreational activities. The lake and surrounding 1.5 million acres became the first national recreation area of the U.S. in 1964. The closest city is Boulder City, NV.