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- w <br /> SOUTH PLATTE BASIN <br /> i <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 2.8 indicates that for August the SOUTH PLATTE RIVER BASIN <br /> )asin water supplies were above normal. Reservoir storage, s Surface Slater Supply Index History <br /> the major component in this basin in computing the SWSI <br /> value, was 113%of normal as of the end of August. Storage - Li,J2k <br /> in the major plains reservoirs, Julesburg, North Sterling, and 3- <br /> ..: , 1 ; . • <br /> Prewitt, decreased by 32,572 acre-feet during August and are 2 E a: • ; .4 •A '' <br /> at 41% of capacity. Storage in the major upper basin 1_ -y i 1-_ -, <br /> reservoirs, Cheesman, Eleven Mile, Spinney, and Antero, g 0 - rir `"- <br /> decreased by 10,170 acre-feet and are at 87%of capacity. The ;t <br /> tit <br /> mean daily flow of the South Platte River at the Kersey gage <br /> a _2- <br /> was 545 cfs, as compared to the long teen average of 630 cfs. <br /> Flow at the Colorado/Nebraska state line averaged 165 cfs. -3- <br /> Flow in the both the tributaries and mainstem -, - <br /> JAN67 JANOI JANB9 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN196 <br /> dropped off beginning in August. Nevertheless,conditions for ,,at„w, <br /> users continued to be favorable throughout the month due to <br /> rainstorms and the use of storage water. The senior call for <br /> the whole summer, the 1871 Western Ditch call, occurred <br /> during the middle of August. The Western call is a common <br /> call on the South Platte, and usually occurs much earlier in SOUTH PLATTE RIVER NR. KERSEY <br /> FLOW BY WATER YEAR <br /> the summer in July. 2.8 - <br /> Rain fall during the last half of the month made 2.6 - <br /> supply conditions so favorable that the direct mainstem call 2.' <br /> downstream of Greeley was replaced by a recharge call. This 2 <br /> will allow for significant recharge to occur prior to filling the • i.e - <br /> reservoirs next year. Reservoir levels continue to be above o o ,.6 _ <br /> average throughout the basin because they started full this W- ,.2 _ <br /> spring and less water was needed this summer due to the s 1 - - <br /> iigher than usual river conditions in July. 1 -- - lrl <br /> 04 <br /> Outlook 0.2 _ ��� - <br /> Irrigation demand will drop off during September as O '----' <br /> Oct Nov Doc Jan Fab NYrch April Nay AIM. July kg; Soot <br /> crops begin to be harvested. The excellent reservoir carryover ,SIT" <br /> and significant recharge now occurring will provide for a good "'°�WET 0OM`""' AVG <br /> X 11196 <br /> start to next year's supply. It is expected that reservoirs <br /> should be able to fill this winter without much difficulty. <br /> Administrative/Management Concerns REPRESENTATIVE RESERVOIRS <br /> The Colorado Big Thompson (CBT) project's Flatiron 260 SOUTH PLATTE RIVER BASIN <br /> Pumping Station near Carter Lake has been repaired. Water <br /> can now be pumped into Carter Lake from the CBT west slope 22C".\\\-/. <br /> sources. This will help to assure an adequate CBT supply next <br /> year for the southern part of the Northern Colorado Water <br /> �� 150 <br /> Conservancy District including the Little Thompson basin, ' 1�0 <br /> Saint Vrain basin,Boulder Creek basin, and a short stretch of g 120 7 <br /> the South Platte downstream of Denver and upstream of the :" 100 <br /> mouth ofS ' V P so <br /> % � 7 <br /> Saint rain Creek. Many users in these basins are 3 e0 A., <br /> very dependent upon the CBT project as a supplemental 10,� • <br /> //A\ <br /> supply. 20_� <br /> Diticn Fkrsetocth Eleven Nile Chseainan Jackson Barr Lake <br /> ® Avg. 8131 Wntenta ® 5/31/96 Content& <br /> - 3 <br />