Crater Lake in Oregon is the deepest lake in the United States. The main feature of Crater Lake National Park, it has a maximum depth of 1,949 ft (594 m) and an average depth of 1,148 ft (350 m). The lake is so-called because it was formed as a caldera basin from the collapse of volcano Mount Mazama approximately 7,700 years ago. Crater Lake has no rivers or streams flowing in or out so it maintains its water levels from the precipitation of rain and snowfall.
photo: Dagmara Mach / wikicommons