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Interim Guidelines for the <br />Operation of Lake Powell <br />and Lake Mead <br />Section 6. Coordinated Operation of Lake Powell and Lake Mead During the <br />Interim Period <br />[Content of 2001 ISG Section 6., Authority, is now found at Section 9., as modified <br />herein.] <br />During the Interim Period, the Secretary shall coordinate the operations of Lake Powell <br />and Lake Mead according to the strategy set forth in this Section 6. <br />The objective of the operation of Lake Powell and Lake Mead as described herein is to <br />avoid curtailment of uses in the Upper Basin, minimize shortages in the Lower Basin <br />and not adversely affect the yield for development available in the Upper Basin. <br />The August 24-Month Study projections of the January 1 system storage and reservoir <br />water surface elevations, for the following Water Year, shall be used to determine the <br />applicable operational tier for the coordinated operation of Lake Powell and Lake Mead <br />as specified in the table below. <br />Consistent with the provisions of this Section 6, equalization or balancing of storage in <br />Lake Powell and Lake Mead shall be achieved as nearly as is practicable by the end of <br />each Water Year. When equalizing or balancing the contents of the reservoirs, <br />scheduled Water Year releases from Lake Powell will be adjusted each month based on <br />forecasted inflow, and projected September 30 Active Storage at Lake Powell and Lake <br />Mead. In this Section 6, the term "storage" shall mean Active Storage. <br />When determining lake elevations and contents under this Section 6, no adjustment <br />shall be made for ICS. <br />Coordinated operation of Lake Powell and Lake Mead as described herein will be <br />presumed to be consistent with the Section 602(a) storage requirement contained in the <br />Colorado River Basin Project Act. <br />Releases from Lake Powell for coordinated operations will be consistent with the <br />parameters of the Record of Decision for the Glen Canyon Dam Final Environmental <br />Impact Statement and the Glen Canyon Dam Operating Criteria (62 Fed. Reg. 9447, <br />March 3, 1997). <br />Notwithstanding the quantities set forth in this Section 6, the Secretary shall evaluate <br />and take additional necessary actions, as appropriate, at critical elevations in order to <br />avoid Lower Basin shortage determinations as reservoir conditions approach critical <br />thresholds. Any actions shall also be consistent with avoidance of curtailment of <br />consumptive uses in the Upper Basin. <br />ROD -Colorado River Interim Guidelines for December 2007 <br />Lower Basin Shortages and Coordinated 49 <br />Operations for Lake Powell and Lake Mead <br />