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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; WNW.water.state.co.us <br /> <br />April 2008 <br /> <br />The Surface Water Supply Index (SWSI) developed by this office and the U.SDA 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 snowpack, reservoir storage, and precipitation for the winter period (November through April). <br />During the winter period, snowpack is the primary component in all basins except the South Platte basin where reservoir <br />storage is given the most weight. <br /> <br />The statewide SWSI values for March range from a high value of +3.6 in the Gunnison Basin to a low value of <br />+0.2 in the Yampa/White Basin. All of the basins experienced a slight decline in the values from last month, except the <br />South Platte Basin. <br /> <br />The following SWSI values were computed for each of the seven major basins for April 1, 2008, and reflect the <br />conditions during the month of March. <br /> <br /> April 1, 2008 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte + 1.1 + 0.9 + 0.2 <br /> Arkansas + 3.1 - 0.2 + 3.8 <br /> Rio Grande + 3.1 - 0.6 + 2.6 <br /> Gunnison + 3.6 - 0.3 + 4.5 <br /> Colorado + 2.7 - 0.2 + 2.3 <br /> Yampa/White + 0.2 -0.4 + 1.5 <br /> San Juan/Dolores + 3.0 - 0.9 + 3.2 <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 /> <br />1 <br />