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COLORADO <br />WATER SUPPLY CONDITIONS UPDATE <br />FROM THE OFFICE OF THE STATE ENGINEER: COLORADO DIVISION OF WATER RESOURCES June 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 +2.4 in the Gunnison Basin to a low value of <br />+0.8 in the Rio Grande Basin. Three of the basins (YampalWhite, South Platte, and San Juan/Dolores} experienced a <br />gain from the previous month's values. Three of the basins (Rio Grande, Arkansas, and Gunnison} experienced a loss <br />from the previous month's values. The Colorado Basin remained unchanged. <br />The following SWSI values were computed for each of the seven major basins for June 1, 2008, and reflect the <br />conditions during the month of May 2008. <br /> June 1, 2008 Change From Change From <br />Basin SWSI Value Previous Month Previous Year <br />South Platte +1.0 +0.3 - 0.1 <br />Arkansas +1.3 -1.4 +2.1 <br />Rio Grande +0.8 -1.6 - 0.2 <br />Gunnison +2.4 - 0.6 +3.5 <br />Colorado +2.3 0.0 +2.4 <br />Yampa/White +1.2 +1.1 +4.2 <br />San JuanlDolores +1.6 +0.2 +2.6 <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 />