Crater Lake Facts | Facts about Crater Lakes

What is the deepest lake in the US?

Crater Lake is the deepest lake in the US, about 1,943 feet deep.

Crater Lake formed about 7,700 years ago when the volcano Mount Mazama erupted and collapsed.

No rivers flow into or out of Crater Lake. It's filled almost entirely by rain and snow.

The "Old Man of the Lake" is a tree stump that has floated upright in Crater Lake since at least 1896.

Crater Lake became a national park in 1902, making it one of the oldest national parks in the US.

Wizard Island in Crater Lake is a small volcano that formed after the lake did.

Crater Lake gets an average of about 42 feet of snow a year.

The Klamath people's oral traditions describe the eruption that created Crater Lake.

Oregon's 2005 state quarter features Crater Lake.

Crater Lake is famous for its clear water, and in 1997 scientists could see a measuring disk about 142 feet down.