What is the deepest lake in the United States?

Crater Lake is the deepest lake in the United States, reaching a maximum depth of about 1,949 feet.

The lake occupies the caldera of Mount Mazama, a volcano in southern Oregon. About 7,700 years ago, a massive eruption emptied much of the volcano’s magma chamber, causing the summit to collapse. Snow and rain gradually filled the resulting basin, creating the intensely blue lake seen today.

Crater Lake has no permanent rivers flowing into or out of it. Its water comes primarily from precipitation and snowmelt, while evaporation and underground seepage remove water. The lake is about 20.6 square miles in area and has an average depth of roughly 1,148 feet. Wizard Island, a volcanic cinder cone, rises above the surface near the western side.

The question normally means deepest by maximum depth. By that measure, Crater Lake is deeper than any other U.S. lake. Lake Superior is much larger by area and volume, but its deepest point is considerably shallower.