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COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES July 2008 <br />ROOM 818, 1313 SHERMAN ST., DENVER, CO 80203 <br />303-866-3581; www.water.state.co.us <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 />The statewide SWSI values for the month range from a high value of 2.1 in the YampalWhite Basin to a low value <br />of 0.9 in the South Platte Basin. Three of the basins (YampalWhite, Rio Grande, Arkansas) experienced a gain from the <br />previous month's values. Three of the basins (Gunnison, Colorado, South Platte) experienced a loss from the previous <br />month's values. One of the basins (San JuanlDolores) remained unchanged from the previous month's values. <br />The following SWSI values were computed for each of the seven major basins for July 1, 2008, and reflect the <br />conditions during the month of June 2008. <br />Basin <br />South Platte <br />Arkansas <br />Rio Grande <br />Gunnison <br />Colorado <br />Yampa/White <br />San JuanlDolores <br />July 1, 2008 Change From Change From <br />SWSI Value Previous Month Previous Year <br />+0.9 - 0.1 -1.5 <br />+1.8 +0.5 - 0.5 <br />+1.6 +0.8 +0.1 <br />+1.8 - 0.6 +1.1 <br />+2.0 - 0.3 +2.0 <br />+2.1 +0.9 +3.8 <br />+1.6 +0.0 +0.3 <br />Scale <br />-4 -3 -2 -1 0 1 2 3 4 <br />Severe Moderate Near Normal Above Normal Abundant <br />Drought Drought Supply Supply Supply <br />