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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 />January 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 January). <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 December range from a high value of 2.8 in the Rio Grande to a low value of -0.1 <br />in the Yampa/White Basin. All of the basins experienced a gain from the previous month's values largely due to the <br />amount of snow received by the State in the month of December. <br /> <br />The following SWSI values were computed for each of the seven major basins for January 1, 2008, and reflect the <br />conditions during the month of December. <br /> <br />Basin <br />South Platte <br />Arkansas <br />Rio Grande <br />Gunnison <br />Colorado <br />Yampa/White <br />San Juan/Dolores <br /> <br />-4 <br />Severe <br />Drought <br /> <br />-3 <br /> <br />-2 <br />Moderate <br />Drought <br /> <br />January 1, 2008 <br />SWSI Value <br />+0.1 <br />+2.4 <br />+2.8 <br />+2.4 <br />+2.1 <br />- 0.1 <br />+2.4 <br /> <br />Change From <br />Previous Month <br />+1.5 <br />+4.9 <br />+5.4 <br />+5.0 <br />+3.8 <br />+3.2 <br />+4.5 <br /> <br />Scale <br />o <br />Near Normal <br />Supply <br /> <br />-1 <br /> <br />1 <br /> <br />Change From <br />Previous Year <br />+0.1 <br />+0.0 <br />+2.5 <br />+0.8 <br />- 0.5 <br />- 3.0 <br />+1.7 <br /> <br />2 <br />Above Normal <br />Supply <br /> <br />3 <br /> <br />4 <br />Abundant <br />Supply <br />