16 U.S.C. § 122a

The Secretary of the Interior is authorized and directed to promptly instigate studies and investigations as to the status and trends of change of the water quality of Crater Lake, and to immediately implement such actions as may be necessary to assure the retention of the lake’s natural pristine water quality. Within two years of the effective date of this provision, and biennially thereafter for a period of ten years, the Secretary shall report the results of such studies and investigations, and any implementation actions instigated, to the appropriate committees of the Congress.