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<br />OJ2343 <br /> <br />to, but unused by, one or more Lower Division States exists and can be used to satisfy beneficial <br />consumptive use requests of mainstream users in other Lower Division States as provided in the <br />1964 U.S, Supreme Court Decree in Arizona v. California (Decree). <br /> <br />Consistent with the above determinations and in accordance with other applicable provisions of the <br />"Law of the River," the AOP was developed with "appropriate consideration of the uses of the <br />reservoirs for all purposes, including flood control, river regulation, beneficial consumptive uses, <br />power production, water quality control, recreation, enhancement of fish and wildlife, and other <br />environmental factors" (Operating Criteria, Article 1(2)). <br /> <br />Since the hydrologic conditions of the Colorado River Basin can never be completely known in <br />advance, the AOP addresses the operations resulting from three different hydrologic scenarios: the <br />probable maximum, most probable, and probable minimum reservoir inflow conditions. River <br />operations under the plan are modified during the year as runoff predictions are adjusted to reflect <br />existing snowpack, basin storage, and flow conditions, <br /> <br />Summary <br /> <br />Upper Basin Delivery. The minimum objective release criterion will control the annual release from <br />Glen Canyon Dam during water year 2005 in accordance with Article ll(2) of the Operating Criteria, <br />unless spill avoidance and/or the storage equalization criteria in Article ll(3) is controlling. To <br />maintain, as nearly as practicable, active storage in Lake Mead equal to the active storage in Lake <br />Powell, releases from Lake Powell greater than the minimum objective of8.23 maf(10,150 mcm) <br />will be made if (1) storage in Lake Powell on September 30,2005, is projected to be greater than <br />14.85 maf (water surface elevation 3,630 feet); and (2) active storage in Lake Powell is greater than <br />active storage in Lake Mead, consistent with Section V of the Interim 602(a) Storage Guideline <br /> <br />Lower Basin Delivery. Under the most probable inflow scenario, downstream deliveries are <br />expected to control the releases from Hoover Dam. Taking into account (1) the existing water <br />storage conditions in the basin, (2) the most probable near..term water supply conditions in the basin, <br />and (3) Sections 2(A)(1) and 7 of the Interim Surplus Guidelines, the normal condition is the <br />criterion governing the operation of Lake Mead for calendar year 2005 in accordance with Article <br />Ill(3)(a) of the Operating Criteria and Article ll(B)(I) of the Decree, <br /> <br />Reclamation does not anticipate any available unused state apportionment for calendar year 2005 at <br />this time. However, if any unused apportionment is available, the Secretary shall allocate any <br />available unused apportionments for calendar year 2005 in accordance with Article ll(B)(6) of the <br />Decree and Section 1 (B) of the Interim Surplus Guidelines. <br /> <br />Water may be made available for diversion pursuant to 43 CFR Part 414(1) to entities within the <br />Lower Division States. The Secretary shall make Intentionally Created Unused Apportionment <br />available to districts in Arizona, California or Nevada for the off-stream storage or consumptive use <br /> <br />(I) Off-stream Storage of Colorado River Water; Development and Release ofIntentionally Created Unused <br />Apportionment in the Lower Division States: Final Rule (43 CFR Part 414). <br /> <br />2 <br />