Which national park contains the deepest lake in the United States?
Answer
Crater Lake National Park
Answer
Crater Lake National Park
Which national park contains the deepest lake in the United States? Crater Lake National Park contains Crater Lake, the deepest lake in the United States.
Crater Lake lies in southern Oregon inside the caldera of Mount Mazama. A huge volcanic eruption about 7,700 years ago emptied part of the mountain’s magma chamber, causing the summit to collapse. Rain and snow gradually filled the resulting basin, creating the intensely blue lake seen today.
The lake reaches a maximum depth of 1,949 feet, measured from the water surface to the bottom. It has no rivers flowing into or out of it; precipitation, evaporation, and underground seepage control its water level. Because the lake is fed largely by rain and snow, its water is exceptionally clear, although clarity varies over time.
A common mix-up is confusing deepest with largest. Crater Lake is the deepest lake in the United States by maximum depth, but it is not the country’s largest lake by surface area. Wizard Island, a volcanic cinder cone, is one of its best-known features.
Source: Wikipedia · fact-checked Aug. 2026