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SOUTH PLATTE BASIN January, 1998 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.0 indicates that for December the SOUTH PLATTE RIVER BASIN <br /> asin water supplies were above normal. Reservoir storage, S Surface Water Supply Index History <br /> the major component in this basin in computing the SWSI 4- <br /> value, was 121% of normal as of the end of November. W 3- .. <br /> } .r. ; '. <br /> • Storage in the major plains reservoirs: Julesburg, North � � .: �_ �Al-�-= <br /> Sterling, and Prewitt, increased by 13,289 acre-feet during 2-71: . L •: ' -^ ;...-- 1 ' <br /> December and are at 85% of capacity. Storage in the major '- ' w �... a <br /> P tY g - <br /> upper basin reservoirs: Cheesman, Eleven Mile, Spinney, and a a <br /> - _ <br /> Antero, decreased by5,100 acre-feet and are at 87% of - 7 <br /> capacity. The Natural Resources Conservation Service reports <br /> -2- <br /> January 1 snowpack as 92% of normal. The mean daily flow o <br /> of the South Platte River at the Kersey gage was 1,249 cfs, as -3- <br /> compared to the long term average of 842 cfs. Flow at the -4 .................... ................ ....... <br /> JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN9S JAN9S JAN97 JAMB <br /> Colorado/Nebraska stateline averaged 1,161 cfs, compared to NONTWYEAR <br /> the long term average of 404 cfs. <br /> Stream flows in the South Platte River and its <br /> tributaries continue to be significantly above average due to <br /> ground water return flows from last year's high water year. <br /> Reservoir storage continued as the primary diversion SOUTH PLATTE RIVER NR. KERSEY <br /> BY <br /> in December, along with diversions for municipal and 450 n°" WATER YEAR <br /> recharge purposes. Many reservoirs have already filled to 400 <br /> their winter storage levels. Some of the plains reservoirs have <br /> 3S0 <br /> stopped taking water to avoid flooding potential created by i <br /> „ —'--d/_:::::: <br /> freezing in their ditches. Most reservoirs both on the Z, '°° <br /> mainstem and tributaries which have not yet filled will do so o i n° <br /> during either the winter or spring. 2 g 2W - <br /> Although snowpack is slightly below average,with the v 150 <br /> present storage and flow conditions the supply conditions <br /> 1°0 . <br /> remain good. <br /> =orb <br /> Administrative/Management Concerns D <br /> Dot Nov Dec Jan Feb March <br /> Due to the excellent storage and flow conditions, mi.. <br /> 13 there was no call downstream of Chatfield Reservoir. WET <br /> `1'°� °R�OW) a AVG x ,99a <br /> Representative Reservoirs <br /> South Platte River 1jaAln <br /> 200 <br /> 240- 7 <br /> 220-7;\ <br /> 180 <br /> i 160 <br /> h 1 12°—A, <br /> ,..._,. ic. <br /> i ea_A., -\\ <br /> ._.,/ ,„ 77 <br /> 4.:7A <br /> DIIIon Fbrs•tooth Eleven Mile Ch•m:mon Jackson Barr Lake <br /> ® Avg. 12/31 Content• ® 12/31/97 Content, <br /> 3 <br />