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Ii <br /> SOUTH PLATTE BASIN <br /> • Basinwide Conditions Assessment: <br /> The SWSI value of 3.4 indicates that for July the basin SOUTH PLATTE RIVER BASIN <br /> grater supplies were well above normal. Reservoir storage,the surf...w.t.r supply nd.x",story <br /> 5 <br /> major component in this basin in computing the SWSI value, 4_ <br /> was 110% of normal as of the end of July. Storage in the - 3-• °� ; , <br /> major plains reservoirs,Julesburg,North Sterling,and Prewitt, <br /> decreased by 31,738 acre-feet during July and are at 72% of 7 1; w 4 <br /> capacity. Storage in the major upper basin reservoirs, gCheesman, Eleven Mile, Spinney, and Antero, decreased by g D , }! . - - -T" <br /> 7,918 acre-feet and are at 102% of capacity. The mean daily _ 1 <br /> flow of the South Platte River at the Kersey gage was 5,334 <br /> a -2_ <br /> cfs, as compared to the 1961-1993 July average of 839 cfs. <br /> Flow at the Colorado/Nebraska state line averaged 4,720 cfs. -3" <br /> While the extremely wet weather did not continue -, .........................................._.......- ...................... <br /> JAN86 JAN87 JAN88 JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 <br /> into July, stream flows continued to far exceed the averages ►ONTw YEAR <br /> for the whole month due to snow melt runoff. This is in <br /> contrast to most years where the runoff generally dissipates by <br /> early July creating very senior call conditions early in the <br /> month. In addition to snow melt runoff, scattered <br /> precipitation events served to augment stream flows. There SOUTH PLATTE RIVER NR. KERSEY <br /> were no calls on the mainstem South Platte during July for 2. FLOW ET"ATE �" <br /> 8 <br /> the first time in several years. There were very few calls on 2.6 <br /> northern tributaries because of the both the snow melt and 2.4 <br /> 2.2 <br /> availability of non-charge water from the Colorado Big 2 - <br /> Thompson project. The project experienced good yield this <br /> 11/H. <br /> year and has significant carryover storage from last year. o 11 6. <br /> One indicator of the wet conditions is that Chatfield ,2 <br /> Reservoir reached approximately 15 feet into its flood pool, is <br /> which is about 1 foot from the reservoir's maximum water V <br /> surface level recorded in May 1980. 0.6 <br /> D <br /> 0.2 <br /> Outlook 0 <br /> Oct N.c Doc Jan P.O Moran 4or II May Juno Ju Iy Aug Soot <br /> High flow conditions did begin to drop off MDNTN <br /> significantly in most areas toward the end of July. A call is ° E``19�' ° °RY"9"' a AVG x 1995 <br /> expected early in August for the South Platte main stem and <br /> most tributaries. In addition to a shorter call period, it is still <br /> anticipated that calls will be less senior than usual. <br /> REPRESENTATIVE RESERVOIRS <br /> Public Use Impacts sovTN PLATTE RIVER BASIN <br /> 26D a <br /> Most crops continue to be behind average growth for 240--7/ <br /> the time of year,and concern remains that an early frost could 220 <br /> 200 <br /> ruin some crops. In contrast, except for fields hit by hail or 180 <br /> flooding, the winter wheat yield was exceptional. b n 160 <br /> Repair of damaged diversion structures and levees, 1•D <br /> which limited the ability of some users to divert water, has a g 120 A. <br /> begun. The sand dams which are typically constructed on the �" <br /> a 1 01/ <br /> /\ 7-7 <br /> lower reaches of the river to facilitate diversions have not \N <br /> been needed. 40- / \ <br /> DI IIon ►orsotootn EIoven MO Is Choosnen Jackson Ehrr LAVA <br /> EZI Avg. 7/31 Cont.nt9 ® 7/7'V95 Wntontc <br /> 3 <br />