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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 81B, 1313 SHERMAN ST., DENVER, CO 80203 <br />303-866-3581; www.water.state.co.us <br /> <br />July 2004 <br /> <br />The state water supplies are generally in a poorer condition than they were in last month's report. The lowest <br />water supply index values were found in the northwest. The Yampa-White Basin and the Colorado Basin index values <br />were computed at -3.3 and -3.0. However, the most significant changes from last month are found in the southwest. <br />The Gunnison Basin, San Juan-Dolores Basin, and the Rio Grande Basin all have a substantially lower index value. <br />Those southwest basins had much lower reservoir storage and stream flow values than the previous month. Precipitation <br />values increased in all areas of the state, but the precipitation component has a low weighting value compared to stream <br />flow and reservoir storage in the final index computation. <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. The fOllowing SWSI values were computed for each of the seven major basins <br />for July 1, 2004, and reflect the conditions during the month of June. <br /> <br /> July 1, 2004 Change From Change From <br /> Basin SWSI Value Previous Month Previous Year <br /> South Platte -0.6 -0.4 -1.0 <br /> Arkansas -2.2 +0.2 -1.3 <br /> Rio Grande -1.4 -2.2 +2.0 <br /> Gunnison -2.2 -2.2 +0.2 <br /> Colorado -3.0 -1.2 - 1.4 <br /> YampalWhite -3.3 -0.1 - 3.3 <br /> San Juan/Dolores -1.4 -2.1 +1.2 <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 /> <br />\",Cl <br />