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SOUTH PLATTE BASIN <br /> • <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 3.2 indicates that for June the SOUTH PLATTE RIVER BASIN <br /> Surface ester Supply Index Hfot°ry <br /> in water supplies were above normal. Reservoir storage, s <br /> me major component in this basin in computing the SWSI <br /> value, was 110%of normal as of the end of June. Storage in _ _ .6 <br /> the major plains reservoirs, Julesburg, North Sterling, and 3 �.: _ <br /> Prewitt, increased by 6,438 acre-feet during June and are at 2 - L "; r <br /> r ter+ "A. <br /> 99%of capacity. Storage in the major upper basin reservoirs, 1 <br /> Cheesman, Eleven Mile, Spinney, and Antero, increased by I D - ' • •" . <br /> 22,428 acre-feet and are at 93% of capacity. The mean daily !A)- <br /> flow of the South Platte River at the Kersey gage was 2,535 <br /> s _2_ <br /> cfs, as compared to the long term average of 2,853 cfs. Flow <br /> at the Colorado/Nebraska state line averaged 807 cfs. -3- <br /> Several rain storms in addition to above average -4 <br /> JAN87 JANB2 JANY9 JAN913 JAN31 JAN92 JAN93 JAN91 JAN95 JAN96 <br /> snowpack runoff provided for excellent river conditions in ,°I,n,{,Y6,R <br /> June. Fortunately,the runoff occurred in a fairly even manner <br /> and the rain was not extremely intense over widespread areas <br /> resulting in very little flooding in the basin. This was in <br /> contrast to last year when the high snowpack runoff and a <br /> wet spring provided for very high stream flows with some SOUTH PLATTE RIVER NR. KERSEY <br /> flooding. 2.8 - <br /> FLOW BY WATER YEAR <br /> The weather and stream flow conditions provided for 2.6 <br /> a good start to the crop growing season. The wet conditions 2.4 <br /> 2.2 <br /> were also a welcome change from the very dry weather on the 2 <br /> plains the previous couple of months. + 1.a <br /> g 1.6 <br /> If0 <br /> Outlook 4= 14 <br /> g 8 1.2 <br /> The wet conditions in June allowed for practically all s 1 <br /> -age reservoirs to fill. Thus, conditions appear to be 0.8 <br /> excellent entering the hotter drier summer months. 6.6 <br /> 04 <br /> Senior calls are expected to occur in July as the runoff 0.2 <br /> ends. However, these calls will occur later than usual due to 0 <br /> Oct Nov Dec Jan Feb Much April May June July Aug Sept <br /> this year's prolonged runoff. MONTH <br /> WET <br /> Because of the high stream flows and reservoir storage 0 <br /> `16"' ° DRY <br /> "°'' a AVG % f996 <br /> levels, no widespread water shortages are expected this <br /> summer. Widespread shortages are not even expected in the <br /> Little Thompson, Saint Vrain, and Boulder Creek basins <br /> despite the temporary inability of the Colorado Big Thompson REPRESENTATIVE RESERVOIRS <br /> project to divert water to these drainage from Carter Lake. 260 SOUTH PLATTE RIVER BASIN <br /> 240 <br /> \�\\ <br /> Administrative/Management Concerns 220 Alf <br /> There was no call on the South Platte mainstem down 200 <br /> s ,60 <br /> stream of Denver during June. Likewise, many of the n ,� <br /> tributaries did not have a call during the majority of the .1 140 <br /> month. The calls which did occur were for storage. 77 <br /> 6D % � <br /> Dl l lon hbrsetooth Eleven Mlle Chessmen Jackson Barr LAke <br /> ® Avg.0/30 Content• ® 8/33110 Contents <br /> 3 <br />