Crater Lake is picture perfect for panoramas with its crystal blue waters. Some of the purest and clearest waters are found at Crater Lake because of the absence of pollutants. Clarity readings by a Secchi disk have averaged between high-20 meter and mid-30 meter (80 to 115-foot) range records, which is very clear for any natural body of water.
No known indigenous fish exist at Crater Lake, but the lake was stocked from 1888 to 1941 with a variety of fish. Several species have since formed self-sustaining populations.