The Muddy River, formerly known as the Moapa River, is a short river located in the southern part of the state of Nevada, in the United States. Approximately 32 miles long, it is located about 60 miles northeast of Las Vegas. The river begins as a series of thermal springs in the Moapa Valley before continuing on its course to Lake Mead, where it drains into the northern arm of the lake near Overton, Nevada. Before the Hoover Dam's construction, the Muddy River flowed into the Virgin River.[1]