- Crater Lake was formed when a massive eruption caused Mount Mazama to collapse.
- Crater Lake is actually a volcanic caldera, not a meteor crater.
- At 1,943-ft, it is the deepest Lake in the U.S.
- It was filled almost entirely by rain and snow.
- The lake’s depth varies about 3-feet seasonally. Incoming flow is balanced by seepage and evaporation.
- Crater Lake is the 6th oldest national park.