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SOUTH PLATTE BASIN Basinwide Conditions Assessment The SWSI value of 0.6 indicates that for June the basin water supplies were near normal. Reservoir storage. the major component in this basin in computing the SWSI value, was 90% of normal as of the end of May. Cumulative storage in the major plains reservoirs: Julesberg, North Sterling, and Prewitt, is at 86% of capacity. Cumulative storage in the major upper.basin reservoirs: Cheesman, Eleven Mile, Spinney, and Antero is at 98% of capacity. Flow at the gaging station South Platte River near Kersey was 576 cfs, as compared to the long-term average of 3.498 cfs. Flow at the ColoradolNebraska state line averaged 224 cfs. The generally dry and warm conditions continued through June. Unlike many years, there was .. not a significant snow runoff during June, with stream flows well below historic averages. As a result, there were calls on the river during the whole month of June, which is unlike average years when a free river exists during a portion of the month. Well timed rain did help keep the call oft the South Platte downstream of Greeley during a portion of the month which allowed for continued recharge along the South Platte and continued storage along the tributaries. However; by the end of the month there were senior irrigation calls along the whole length of the South Platte. Outlook Stream flow conditions this summer should be helped by the fact ,that the major reservoirs on both plains and tributaries were able. to filt this year, and the fact that there was considerable ground water ,recharge along the South Platte during the spring. The.se items will help to assure an adequate irrigation supply later in the year even if there is not significant precipitation during the rest of the summer. Municipal supplies remain in generally good condition due to adequate reservoir storage and drought planning. However, isolated physical shortages may occur in some basins. as occurred last year. Jul-01 s::x.JIlfA.ATlElIA9NsV& HS1"(R( J ~ 5 .. ----- _._.._. ..-.-_. ___ /. w ~, . :> )( ~o ~ >- -, 2S .2 I -<l 4 ....1Zl_Jo>OlR>llG___.___ M:MH/'aiM SOJIH PLAT1E ~ toR ~,~ BY WA~ 'Y9R 3,<XXl,<XXl mo.lXXl .....---< / I 1/ / 1/ - /. ./ --- .'"" ... 2,500,lXX) ~ ! :i 2,<XXl,lXXl ~ oc 1,mo.lXll ~ ~ ::> 1,<XXl,<XXl a o O::tl'b.>cecJanFebMrdl~""'..b1eMyhQSEI1 -II- v.ET (1llll3) -+- [RY' (1984) -Ir-AVG "*:ml REl'RESENTAT\VE RSSERvtlIRS 3OO.ClOO 2llO.ClOO l. 200.000 /. g tV .; 01150.000 S tJ) ! l) ,oo,ClOO ::l lIO.OOO 0iIl0n HlneIooth EIeMt MIe "- JacIcaon IlarrUlle 8Avg. o&;jQ COnIenIa lotV>>'Of CaUlllS 3 .1' :. oi:.-.