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r <br /> SI <br /> SOUTH PLATTE BASIN <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.2 indicates that for May the SOUTH PLATTE RIVER BASIN <br /> basin water supplies were above normal. Reservoir storage, 5 5u,•c° =.r S,ppply ind.x HI°LOry <br /> the major component in this basin in computing the SWSI 4_ <br /> value, was 101%of normal on May 31. Storage in the major . <br /> plains reservoirs, Julesburg, North Sterling, and Prewitt, 3 A 1 ,e - <br /> decreased by 1,333 acre-feet during May and are at 96% of 2 �- '� ± ::-- -. <br /> capacity. Storage in the major upper basin reservoirs, 1UJ ---`. • " 4 <br /> Cheesman, Eleven Mile, Spinney, and Antero, increased by g ° r"' T l r"�, ''�, '` "=;;-'" I <br /> 24,138 acre-feet and are at 96% of capacity. The mean daily _ '; ii`; <br /> flow of the South Platte River at the Kersey gage was 4,301 <br /> e: -2_ <br /> cfs, as compared to the 1961-1993 May average of 2,264 cfs. <br /> Flow at the Colorado/Nebraska state line averaged 1,271 cfs. 3 <br /> The National Weather Service computes basin precipitation as -4 i ..- <br /> JAN86 JAN07 JANB8 JAN89 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 <br /> 209% of normal during the month. The Natural Resources MONTH/YEAR <br /> Conservation Service reports June 1 snowpack as 374% of <br /> normal. <br /> In addition to the heavy mountain snowfall during <br /> May,lower elevations received much rain resulting in flooding <br /> along the Big Thompson, Saint Vrain, Boulder Creek, Clear SOUTH PLATTE RIVER NR. KERSEY <br /> Creek, and portions of the South Platte downstream of these 2.B FLOW By WATER YEAR <br /> tributaries. This flooding caused some property damage 2 6 fi <br /> including damage to diversion structures. 2.4 <br /> 2.2 <br /> 1 2 <br /> Outlook a <br /> u <br /> Most reservoirs on both the mainstem and tributaries 3 0 16 <br /> _ .. 4 <br /> are either full oR should fill during the first few weeks of W i 1.2_ <br /> June. It is even expected that Spinney Mountain Reservoir s� <br /> will fill for the first time in several years under its direct 1 00 ..f.o <br /> °.6 <br /> priority. <br /> .. <br /> The last two month's much above average 0 2 ---. i ,C==• <br /> precipitation has eliminated the concern of last winter of a ° <br /> Oct Nuv pee Jan Feb March April May June July Aug Sept <br /> shortage of water this summer, replacing it with concern that MONTH <br /> there will be flooding this spring due to the combination of ° "ET`1983, ° COY(19W) A AVG K 1995 <br /> precipitation, high runoff, full reservoirs, and generally <br /> saturated conditions. This concern exists both on the <br /> mainstem and the tributaries. <br /> Water supply for all uses should be significantly above <br /> average this summer and the river call within most drainages REPRESENTATIVE RESERVOIRS <br /> will occur later and be less senior than most years. 220 7 SOUTH PLATTE RIVER BASIN <br /> 200_, <br /> Administrative/Management Concerns 180� N <br /> There was very little use of water directly for % 180 <br /> irrigation during May,with no calls for direct irrigation on the a 140_� <br /> mainstem. Calls did exist for storage and municipal use on g 120 /\ <br /> the upper South Platte. v.13 <br /> There is a concern over the safety of dams within the a" 80-� <br /> basin as wet conditions increase the potential for dam I 60 <br /> problems. Staff are on the alert for any possable required 40 <br /> action. 2 M M <br /> ° <br /> Dillon Hers.teeth Eleven Mlle Cheecaen Jackson Barr lake <br /> Public Use Impacts �l1' <br /> The wet conditions have affected the plans of some ® A; 5,31�nL°"`° L� SJ9!95 Contents <br /> farmers as they were unable to plant their corn. <br /> 3 <br />