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. . Operating Criteria for Glen Canyon Dam In accordance with the Grand Canyon Protection Act of 1992 These Operating Criteria are promulgated in compliance with section 1804 of Public Law 102- ,575, the Grand Canyon Protection Act of 1992. They are to control the operation of Glen . Canyon Darn, constructed under the authority of the Colorado River Storage Project Act. These Operating Criteria are separate and apart from the Criteria for Coordinated Long-Range Operation of Colorado River Reservoirs prepared in compliance with the Colorado River Basin Project Act of 1968. 1, Annual Repon As required in the Grand Canyon Protection Act, a repon sha1l be prepared and submitted to Congress annually that describes the operation of Glen Canyon Dam for the preceding water year and the expected operation for the upcoming water year, The annual plan of operations shall include such detailed rules and quantities as are required by the Operating Criteria contained herein. It sha1l provide a detailed explanation of the expected hydrologic conditions for the Colorado River immediately below Glen Canyon Dam. 2. Review of Criteria The Secretary of the Interior shall review these Operating Criteria as the result of actual operating experiences to determine if the Operating Criteria should be modified to better accomplish the purposes of the Grand Canyon Protection Act. Such a review sha1l be made at least every 5 years in consultation with the appropriate Federal agencies, Governors of the Colorado River Basin States, Indian Tribes, representatives of academic and scientific communities, environmental organizations, the recreation industry, and contractors for the purchase of Federal power produced at Glen Canyon Dam. 3. Specific Operational Constraints The plan of operations will fonow the description of the preferred alternative (Modified Low Fluctuating Flow) in the Operation of Glen Canyon Dam FmaI Environmental Impact Statement and its Record of Decision. The specific criteria are as follows: Minimum Releases- 8,000 cfs between 7 a.m. and 7 p.m. 5,000 cfs at night Maximum Releases- 25,000 cfs. Several circumstances warrant exception to this restriction. These are the Beach/Habitat Building Flows and the Habitat Maintenance Flows (both described below) and the release of large volumes of water to avoid spills or tloodt1ow releases from Glen Canyon Dam. These latter releases would most likely result from high snowmelt nmoffinto Lake Powell; if such high releases above 25,000 cfs are required, they shall be made at constant daily tlow rates.