What rivers drain into lake Powell?

Lake Powell is drained by the Colorado River, which flows through the canyonlands of Utah and Arizona, and the San Juan River, which joins the Colorado River in Glen Canyon. The Colorado River is the primary source of water for Lake Powell, and it is also the river that has carved out the canyons and mesas that surround the lake. The San Juan River is a major tributary of the Colorado River, and it drains a large area of the southwestern United States.