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SOUTH PLATTE BASIN September, 1997 <br /> Basinwide Conditions Assessment: <br /> The SWSI value of 4.0 indicates that for August the SOUTH PLATTE RIVER BASIN <br /> >lasin water supplies were well above normal. Reservoir 5 &"'«Water Supply Index"Iptary <br /> storage, the major component in this basin in computing the ,_ <br /> SWSI value, was 124% of normal as of the end of August. _ -y iStorage in the major plains reservoirs: Julesburg, North 3 . ;` 1Sterling, and Prewitt, decreased by 16,858 acre-feet during 2 wLa -August and are at 57% of capacity. Storage in the major f. �' -�-- -upper basin reservoirs: Cheesman, Eleven Mile, Spinney, and ! D �" � �- �'' - <br /> Antero, decreased by 2,000 acre-feet and are at 93% of - <br /> capacity. The mean daily flow of the South Platte River at the <br /> a -2— <br /> Kersey gage was 2,397 cfs, as compared to the long term <br /> average of 762 cfs. Flow at the Colorado/Kansas stateline -3- <br /> averaged 1,923 cfs,compared to the long term average of 153. --, i -. •••- �• .. ....... .— <br /> JAMB JAMS JAN90 J0161 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 <br /> The flow in both the tributaries and South Platte MONTH,YEAR <br /> mainstem continued at higher than average levels during <br /> August due to extremely wet conditions during much of the <br /> month. These wet conditions served to increase flows in the <br /> AIM <br /> stream but at the same time reduce demand for these flows "_" <br /> for irrigation and other purposes. The flow levels were SOUTH PLATTE RIVER NP. KERSEY <br /> extremely unusual for the basin for August,which is generally FLOW WATER �"" <br /> the month with the most senior calls: There-were no calls on 2.6 - <br /> the South Platte downstream of the Denver area the entire 24- <br /> 2.2 — r _ _ _ <br /> month. The high stream flows allowed'the-refilling of some i 2 <br /> reservoirs which is also very unusual. As a result, reservoir : 1.B <br /> levels are very high for this time of year. a ,.6 ' - <br /> 9— <br /> 1. <br /> Outlook s 1 <br /> Remaining irrigation demand will drop off during 1 <br /> September as crops begin to be harvested. The main concern <br /> 0-. <br /> at this point is that temperatures-are warm enough and the 0.2 • <br /> weather dry enough to allow crops to.finish growing and D - <br /> Oct Nov D•c Jan Feb March AprII May June July Aug 5•Pt <br /> farmers to get into their fields for harvest. . ,C.,T„ <br /> The excellent reservoir carryover and significant (19C3) o DRY(1964) a AVG x 1997 <br /> recharge now occurring will provide for a good start to next <br /> year's supply. It is expected that reservoirs that are not <br /> already full should be able .to fill this winter without <br /> significant difficulty. REPRESENTATIVE RESERVOIRS <br /> scum PLATTE RIVER BASIN <br /> 260 <br /> Public Use Impacts 240- 7 <br /> A legislative committee went on a tour of the South 22° <br /> Platte during August. Their goal was to learn more • 12 <br /> 4. <br /> concerning the issues which face the basin, including <br /> �n 150 <br /> environmental issues associated with the endangered species ' „D�� <br /> .� f <br /> A <br /> in Nebraska. b g 120 <br /> D20 /��\ „fi \\\ �1\ �n7 r77 <br /> DIIIon Ner••toeth Stevan YII• Chaw•an Jacraon Barr Lak• <br /> ® Aug. 9/31 eont•nta ® 9/31/97 Centime <br /> 3 <br />