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• <br /> SOUTH PLATTE BASIN January, 1999 <br /> V Basinwide Conditions Assessment: <br /> The SWSI value of 1.0 indicates that for December the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were near normal. Reservoir storage,the s Surfed*eat. S lr l.A.,Hl story <br /> major component in this basin in computing the SWSI value, 4_ _ <br /> was 103% of normal as of the end of December. Storage in W 3_ , l�' l :_ ,. <br /> the major plains reservoirs: Julesburg, North Sterling, and _ r _- ` <br /> Prewitt, increased by 18,750 acre-feet during December and 2- ,)"' =',L1.4 <br /> ` " <br /> .4 -- �, <br /> 1 <br /> is at 62% of capacity. Storage in the major upper basin . ; ,. - ,_ <br /> 1��-^+� .. <br /> '1 1 <br /> reservoirs: Cheesman, Eleven Mile, Spinney, and Antero, o D ~�P <br /> 1,- I <br /> decreased by 5,375 acre-feet and are at 80%of capacity. The <br /> Natural Resources Conservation Service reports January 1 <br /> snowpack is 75% of normal. The mean daily flow of the a _2 <br /> South Platte River at the Kersey gage was 1,106 cfs, as 3- <br /> compared to the long term average of 840 cfs. Flow at the <br /> .. JAN91 40192 JA493 JAN94 JANOS JAN99 JAN97 JAN99 JAN99 <br /> Colorado/Nebraska state line averaged 464 cfs. ,,YEAR <br /> Although snowpack is below average, water supply <br /> conditions remain good with current storage and flow <br /> conditions. Stream flows continue to be average or above <br /> average for most of the South Platte Basin. Reservoir storage <br /> continues as the primary diversion in December along with SOUTH PLATTE RIVER NR. KERSEY <br /> diversions for municipal and recharge purposes. Many ASD FLOW BY WATER YEAR <br /> reservoirs have already filled to their winter storage levels. 400 <br /> Some of the plains reservoirs have stopped taking water to <br /> 390 <br /> avoid any flooding potential from freezing in the inlet ditches. 1 <br /> 300 <br /> i <br /> 1.-------------Y <br /> Outlook 2 250 . <br /> or <br /> It appears that most reservoirs that have not yet filled, W g 200 <br /> both on the mainstem and on the tributaries, will fill this 5 V 10 <br /> winter and spring. i <br /> 100 <br /> Administrative/Management Concerns SD .._________. <br /> Due to the excellent storage and flow conditions, D <br /> Oat Ilbc D.c Jan Fab March <br /> there was no call downstream of Chatfield Reservoir. , ,T" <br /> 0 WET(1993) o DRY(1964) A AVG X 1999 <br /> Public Use Impacts <br /> None. <br /> Representative Reservoirs <br /> 260 South Platte River Basin <br /> 240— <br /> 220— \\1l <br /> 200 <br /> NN <br /> M <br /> 190 <br /> a <br /> b 160 <br /> - <br /> I140 <br /> i 2 120 //f'�\ <br /> ; 80 A 7 <br /> 40 <br /> A' \ <br /> Dillon Hors.tooth Eleven MI1. Ch...nen Jackson Burr Lake <br /> ® Avp. 12/31 Contents ® 12/31/98 Content. <br /> 3 . <br />