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SOUTH PLATTE BASIN February, 1999 <br /> lk Basinwide Conditions Assessment: <br /> The SWSI value of 1.6 indicates that for January the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were slightly above normal. Reservoir 5 Surface Water Supply '"°'"History <br /> storage, the major component in this basin in computing the 4 <br /> SWSI value, was 100% of normal as of the end of January. - I ill, 1 I 11 <br /> u< 3 Ii III 111111 I, ,I I Ili I iI <br /> Storage in the major plains reservoirs: Julesburg, North 3 I in, ,111 11111 11l IIII,+n 1 II <br /> 1 1 1 nil, i 111 mil in IIIIIIn lin <br /> Sterling, and Prewitt, increased by19 500 acre-feet during2 it 1'. I, 1 111111 ,111 111111111 11111111, 1111111 <br /> ,II 11,1 1111 1111111 111 III 11111,111 11111111, 1111111 , <br /> • 1 <br /> January and is at 78%of capacity. Storage 111 the major upper ! ell !IIII. min Llillll I , III iIR lilfllllll IIIIIIII, 1111111 ',I <br /> 1111 Il l l n ,111111 ,111111111 Ill 111 11111,1111 11I I N 11 1111111 1 <br /> basin reservoirs:Cheesman,Eleven Mile,Spinney,and Antero, i. 1 IIHiI linen! !!hell!111u i III Illllllnl 11111111 1111111 I <br /> 111111 1111111 1III11II lun'llll 1 I ,III j 1 ll, II1111111 IIIIIIIII IIIIIII 1 <br /> decreased by 3,093 acre-feet and is at 79% of capacity. The • 0, I I,' ; I <br /> 1 1 l 1 <br /> Natural Resources Conservation Service reports that February l 1 <br /> . -2 1 <br /> 1 snowpack is 89% of normal. The mean daily flow of the <br /> South Platte River at the Kersey gage was 982 cfs, as -3 <br /> compared to the long term average of 813 cfs. Flow at the <br /> JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 JAN99 JAN99 <br /> Colorado/Nebraska state line averaged 704 cfs. AONTWYEAR <br /> River flows continued average or above average for <br /> the month of January on both tributaries and the mainstem of '" <br /> the South Platte. Diversions in January continued primarily <br /> for storage, recharge, and for direct municipal use. Most <br /> major reservoirs diverted in January as conditions allowed for SOUTH PLATTE RIVER NR. KERSEY <br /> diversions because of the warm temperatures. 450 FLOW BY WATER YEAR <br /> 400 <br /> Outlook <br /> 950 - <br /> The snowpack in the mountains remains i <br /> approximately average in the northern part of the basin and + 300 <br /> below average in the southern basin. There is not too much A 25a <br /> concern yet that there will be dry conditions as final di <br /> 200 . <br /> snowpack levels will be affected by the snowfall the next two s v 150 <br /> months, generally the period when the basin gets the most i <br /> 100 <br /> precipitation. <br /> There have been some predictions, based upon 50 <br /> historic weather patterns, that we are entering a drier cycle. ° <br /> Oct Nov Osc Jan Feb March <br /> MONTH <br /> 0 WET(1963) O ORY 0914) A AVG X 1999 <br /> Administrative/Management Concerns <br /> The call on the South Platte was for direct flow uses <br /> for Denver and for storage in irrigation reservoirs located on <br /> the north end of Denver. This is normal for this time of year. <br /> REPRESENTATIVE RESERVOIRS <br /> Public Use Impacts 240 SOUTH PLATTE BASIN SUPPLY <br /> None. 220- <br /> 200 <br /> N 190-//�\� <br /> 160-//... \\ <br /> is <br /> v 100 J \\//-�\ J <br /> i so <br /> I GO <br /> 40 1 /\ � /�' 720 7\\ <br /> ° <br /> Dillon 1k+rsatooth Eleven Mlle Cheeses, Jackson Barr Lake <br /> ® AVq. 1,31 contents ® 1/91v99 Contents <br /> 3 <br />