Grand Canyon Protection Act

Grand Canyon Protection Act - Directs the Secretary of the Interior to: (1) operate Glen Canyon Dam and take other reasonable mitigation measures to protect, mitigate adverse impacts to, and improve the condition of the environmental, cultural, and recreational resources of Grand Canyon National Park and Glen Canyon National Recreation Area; (2) promulgate interim operating procedures for Glen Canyon Dam in consultation with the Department of the Interior, the Secretary of Energy, specified State Governors, and Indian tribes and with the full participation of the general public, including the academic and scientific communities, environmental organizations, the recreation industry, and contractors for the purchase of Federal power produced at Glen Canyon Dam; (3) implement such procedures pending development of long-term operating procedures; and (4) establish and implement long-term monitoring requirements. Subjects such operating procedures to the water storage and delivery functions of Glen Canyon Dam pursuant to laws relating to allocation of the Colorado River. Authorizes the Secretary of the Interior to deviate from such interim operating procedures to: (1) comply with requirements under this Act; (2) respond to hydrologic extremes or power system operating emergencies; or (3) further reduce adverse impacts on resources downstream.

Directs the Secretary, no later than December 31, 1993, to complete the Glen Canyon Environmental Studies and the final Glen Canyon Dam Impact Statement as required under the National Environmental Policy Act of 1969.

Directs the Comptroller General to review the costs and benefits to water and power users and to natural, recreational, and cultural resources resulting from management policies and dam operations identified in the Impact Statement and report the results of such audit to the Secretary and the Congress.

Directs the Secretary to implement the long-term operating procedures for the Dam, based on the Studies and the Statement and audit, alone or in combination with other reasonable mitigation measures, and to submit the Studies and the Statement and the long-term operating procedures to the Congress.

Prohibits such long-term operating procedures from interfering with the primary water storage and delivery functions of the Glen Canyon Dam pursuant to laws relating to allocation of the Colorado River.

Amends the Colorado River Storage Project Act to prohibit the Secretary from operating the hydroelectric powerplant at the Dam in a manner which causes significant and avoidable adverse effects on resources of the Grand Canyon National Park or the Glen Canyon National Recreation Area.

Authorizes appropriations.

Provides that nothing in this Act shall be interpreted as modifying or amending laws relating to environmental or natural resources protection, with regard to the operation of the Glen Canyon Dam.