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SOUTH PLATTE BASIN <br />Basinwide Conditions Assessment <br />The SWSI value for the month was 0.9. Reservoir <br />storage in billion, Horsetooth, Eleven Mile, Cheesman, <br />Jackson, and Barr Lake, the major component in this basin <br />in computing the SWSI value, was 103% of normal as of the <br />end of June. Cumulative storage in the major plains <br />reservoirs: Julesberg, North Sterling, and Prewitt, is at 75% <br />of capacity. Cumulative storage in the major upper-basin <br />reservoirs: Cheesman, Eleven Mile, Spinney, and Antero is <br />at 100% of capacity. Flow at the gaging station South Platte <br />River near Kersey was 682 cfs, as compared to the long- <br />term average of 2321 cfs. Flow at the Colorado/Nebraska <br />state line averaged 77 cfs. <br />Outlook <br />Flow conditions remained below average in June for <br />the mainstem of the South Platte below Kersey. With the <br />lower than average flow, there was a direct flow call almost <br />the entire month. Some users had to use their storage <br />supplies for crop irrigation reducing available supply later in <br />the summer. This call impacts the ability of users to refill any <br />storage space used for early irrigation and eliminates the <br />ability to recharge. <br />The conditions on the South Platte above Kersey <br />and tributaries were considerably better as the rights in these <br />areas are generally senior to those on lower end of the river. <br />We will continue to see some runoff from South Park and <br />down Clear Creek for the first half of July. This should keep <br />the calls from becoming too senior in the upper part of the <br />river above Kersey. <br />While farmers may be short water on the lower end <br />of the river, the supply for all the front range municipalities <br />are in good shape with the present storage conditions. <br />3 <br />Jul-08 <br />JJIJTH PLATTE 6ASIN SWSI HISTORY <br />4 <br />3 <br />2 <br />~, <br />W <br />J <br />Q <br />X <br />W <br />0 <br />-, <br />0 <br />-2 <br />-3 <br />Jan-99 Jan-00 Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 Jan-07 Jan-08 <br />MONiHIYEAR <br />SOUTH PLATTE RIVER NR. KERSEY, FLOW BY WATER YEAR <br />3,000,000 <br />~ 2,500,000 <br />m <br />L <br />Q 2,000,000 <br />0 <br />~ 1,500,000 <br />W <br />~ 1,000,000 <br />U <br />500,000 <br />0 <br />Oct Nov Dec Jan Feb March Apnl May June July Aug Sept <br />~ WET (1983) ~ DRY (1964) ~ AVG ~ 2008 <br />