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<br />COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br /> <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES <br />ROOM 818,1313 SHERMAN ST., DENVER, CO 80203 <br />303-866-3581; www.water.state.co.us <br /> <br />July 2007 <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U.S.D.A. Natural Resources <br />Conservation Service is used as an indicator of mountain-based water supply conditions in the major river basins of the <br />state. It is based on stream flow, reservoir storage, and precipitation for the summer period (May through October). <br />During the summer period, stream flow is the primary component in all basins except the South Platte basin where <br />reservoir storage is given the most weight. <br /> <br />The statewide SWSI values for July range from a high value of 1.3 in the South Platte Basin to a low value of -3.7 <br />in the Yampa/White Basin. All of the basins (South Platte, Arkansas, Rio Grande, Gunnison, Colorado, Yampa/White, <br />and San Juan/Dolores) experienced a loss from the previous month's values. <br /> <br />The following SWSI values were computed for each of the seven major basins for July 1, 2007, and reflect the <br />conditions during the month of June. <br /> <br /> July 1, 2007 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte +1.3 - 1.1 +1.8 <br /> Arkansas +0.6 - 1.7 +2.2 <br /> Rio Grande +0.5 - 1.0 +1.3 <br /> Gunnison - 0.5 - 1.2 - 0.5 <br /> Colorado - 1.0 - 1.0 +0.4 <br /> Yampa/White - 3.7 - 2.0 - 2.4 <br /> San Juan/Dolores - 0.4 - 1.7 +2.3 <br /> Scale <br />-4 -3 -2 -1 0 2 3 4 <br />Severe Moderate Near Normal Above Normal Abundant <br />Drought Drought Supply Supply Supply <br />