<P> Crater Lake ( Klamath : giiwas ) is a caldera lake in south - central Oregon in the western United States . It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity . The lake partly fills a nearly 2,148 - foot ( 655 m ) - deep caldera that was formed around 7,700 ( ± 150 ) years ago by the collapse of the volcano Mount Mazama . There are no rivers flowing into or out of the lake ; the evaporation is compensated for by rain and snowfall at a rate such that the total amount of water is replaced every 250 years . With a depth of 1,949 feet ( 594 m ) , the lake is the deepest in the United States . In the world , it ranks ninth for maximum depth , and third for mean ( average ) depth . </P>
<P> Crater Lake ( Klamath : giiwas ) is a caldera lake in south - central Oregon in the western United States . It is the main feature of Crater Lake National Park and is famous for its deep blue color and water clarity . The lake partly fills a nearly 2,148 - foot ( 655 m ) - deep caldera that was formed around 7,700 ( ± 150 ) years ago by the collapse of the volcano Mount Mazama . There are no rivers flowing into or out of the lake ; the evaporation is compensated for by rain and snowfall at a rate such that the total amount of water is replaced every 250 years . With a depth of 1,949 feet ( 594 m ) , the lake is the deepest in the United States . In the world , it ranks ninth for maximum depth , and third for mean ( average ) depth . </P>
where does crater lake 's water come from
where does crater lake 's water come from
rain snowfall
rain snowfall