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I I I I I I I I I. I I I I I I I I I I COMPACT ENTITLEMENTS Colorado River Compact The State of Colorado is a signatory state in two major interstate compacts relating to the Colorado River. The Colorado River Compact allocates the water of the Colorado River basin between the upper basin states (Colorado, Wyoming, Utah, and New Mexico) and the lower basin states (Nevada, Arizona, and California). The Upper Colorado River Compact allocates the upper basin states' entitlement among the upper basin states. The Upper Colorado River Compact divides the consumptive use available to the Upper Basin, based on the following percentages: Colorado New Mexico Utah Wyoming 51.75% 11.25% 23.00% 14.00% The Upper Colorado River Compact requires Colorado to deliver sufficient water from the San Juan River and its tributaries (including the Animas River) to allow New Mexico to make full use of its Colorado River entitlement (11.25 percent of the Upper Basin consumptive use). The CWCB informally convened an ad hoc Endangered Fish Flow and Colorado River Compact Water Development Workgroup to assist in estimating and protecting the future uses of Colorado's unused compact apportionment in the Colorado River basin. This workgroup prepared a report in 1995 entitled, "Colorado River Compact Water Development Projection." The workgroup determined that the San Juan River basin in Colorado, which includes the Animas River, San Juan River mainstem, Piedra River, La Plata River, and other streams, produces an average natural flow of 1,938,200 acre-feet per year, of which the then-present (1985) consumption within Colorado was 259,600 acre-feet per year. Based on data presented in the Bureau of Reclamation report, "Colorado River System Consumptive Uses and Losses Report" (Revised December 2004), the annual consumption within the San Juan River Basin in Colorado averaged 353,600 acre-feet during 1996-2000, a substantial increase over the previous estimate. 5