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n~:~ 0"0 4.J ...) ...i,. -/ 'V ..) SOUTH PLATTE BASIN Jun-Q1 Basinwide Conditions.Assessment The SWSI value of 2.3 indicates that for May the basin water supplies were above normal. ReserVoir storage, the major component in this basin in computing the SWSI value, was 91 % of normal as of the end of May. Cumulative storage in the major plains, reservoirs: Julesberg, North Sterling, and Prewitt, is at 99% of capacity. Cumulative storage in the major upper-basin reservoirs: Cheesman,' Eleven Mile, Spinney, and Antero is at 92% of capacity. The Natural Resources Conservation Service reports that June 1 snowpack is 22% of normal. Flow at the gaging station South Platte River near Kersey was 1,257 cfs, as compared to the long-term average of 2,609 cfs. Flow at the Colorado/Nebraska state line averaged 587 cfs. Outlook Use for recharge and reservoir storage began to be replaced by direct flow irrigation demand in May. A storm early in May, the beginning of runoff and limited demand, kept the mainstem call junior during the month. The senior call in May was a North Sterling direct call toward the end of the month. By the end of the month, the call was back to a recharge call. Conditions allowed for significant recharge to occur during most of May. Administrative/ManaQement Concerns Snowpack return~d to below average in May though it is difficult to determine the accuracy of snowpack numbers . very late in the year. Weare unsure how good the runoff will be this year though there does seem to be good snowpack in the Clear Creek basin, a basin which often supports diversions in the river betWeen Denver and Kersey until the end of June. Runoff will be dependent on conditions the next few, weeks including rainstorm precipitation that is sometimes severe in June. Runoff and rainstorm in June often delay the call until toward the end of the month. The main stem reservoirs are full going into June helping to assure the supply for this: summer for irrig'ators. Municipal suppliers generally have adequate suppHes going into this summer. Public Use Impacts None. SOJIliRAT11:8'SNSYS HSJmV ~ .' ,----- ._--,-. -..'---- IJJ ~ ' > ~o Iii ~2 >- ., '''' o .2 .3 -4 ~ - - - - _, - .>>>411I J.tGI ........ M:WIH/'l'EAA SOUTH PlATTE RIVER NR KERSeY. A.ON BY WATER Y66f! 3,000,000 500,000 -- -- -.--. ~ V. I, 1/ / V ,/" ~ ./ ~ --- 8l 2.500,000 iT ~ 2,000,000 ~ ..J :.t 1,500.000 ;:: .~ :::> 1.000.000 ::< :::> u o Oct Nlv Dec.Jati Feb Mirm Ppil May JIOO .>>t Aug Sept ......1JIEr (1!l63) , --+- rRY (1964) , __ AVG '*" 2001. RePRESENTATIVE RESERIIOIRS 250.000 5O.lXIO i- 200.000 ! g 150,000 f Vl 1l'OO,ooo S ;. 01100 Horseloolh ae-. MIe 0Ie88man .Jacksoo BlllrLake .A\'g. 05131 Contents II D5131Kl1 Ccrll-* 3 , .). . L "U-.