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Colorado Water Supply Report Keith Vander Horst. Division of Water Resources, Water Supplv Conditions Update Below you will find information from Keith Vander Horst's report for the month of May, ---The following is a brief water supply conditions update, (A complete water supply update appears on the CWCB webpage,) South Platte Basin SWSI value (-0,2) indicates that for April the basin water supplies were near nonnal. Reservoir storage was 105% of nonnal at of the end of April. Storage levels in the major plains reservoirs: Julesburg, North Sterling, and Prewitt are at 97% of capacity, Cumulative storage in the major upper-basin reservoirs of Cheesman, Eleven Mile, Spinney, and Antero is at 82% of capacity, The May 1 snowpack is 77% of nonnal. Arkansas Basin SWSI value (-1.4) indicates that basin water supplies were slightly below nonnal for April. The May 1 snowpack was 107% of nonnal. Streamflows at the gaging station near Portland were 291 cfs, as compared to the long-term average of 431 cfs, Storage in Turquoise, Twin Lakes, Pueblo, and John Martin reservoirs totaled 78% of normal at the end of April. Rio Grande Basin SWSI value 2,7 indicates that basin water supplies were above normal for April. The May 1 snowpack is 139% of normal. At the end of April storage in Platoro, Rio Grande, and Santa Maria reservoirs totaled 64% of normal. Flow to the state line was 163% of nonnal. Precipitation and temperatures were above average, Streamflow was well above average during the first three weeks of April resulting in an early runoff from the abundant snowpack. Gunnison Basin The SWSI value 2,7 indicates that for April basin water supplies were above nonnal. The May 1 snowpack was 125% of nonnal. Streamflows at the gaging station at Uncompahgre River near Ridgeway were 134 cfs, as compared to the long-tenn average of 110 cfs, Storage in Taylor Park, Crawford, and Fruitland reservoirs totaled 112% of normal as of the end of April. Colorado Basin The SWSI value (-0,1) indicates that April basin water supplies were near normal. The May 1 snowpack is 88% of normal. Flow at the gaging station near Dotsero was 1,384 cfs, as compared to the long-term average of 1,779 cfs, Storage in Green Mountain, Ruedi, and Williams Fork reservoirs totaled 123% of average at the end of April. Yampa/White Basin The SWSI value (-2,3) indicates that water supplies were below normal for the end of April. The May 1 snowpack is 79% of nonnal. Streamflows at the gaging station at Yampa River at Steamboat were 476 cfs, as compared to the average of 589 cfs, Precipitation in April was 94% of average across the basin,