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SOUTH PLATTE BASIN <br /> , <br /> Basinwide Conditions Assessment <br /> The SWSI value of +2.1 indicates that the overall SURFACE WATER SUPPLY I NOEX <br /> conditions are above normal. Reservoir storage, the key a emu*" M.".'""'^ <br /> mponent in this basin in computing the SWSI value, was. <br /> __9% of average on October 1. Storage in the major plains �� Ili I. <br /> 1• : iilillll IIL 11 1 11 11 II u <br /> reservoirs decreased by 17,660 acre-feet for the month. This i 1 IIIIIIII IIII I I.;11 11 l' II II <br /> l 1 limn I IIf1 I,,Ii1111 IIL1: 111111 u <br /> is normal for the month of September as irrigation demands III II , 11111111 I 1111 11111,II 11111I11, 1.1111I1 11 , 11111 III II 1 11111111 I„11I11 11111111f!l,illllnl11111iIII:111 111 I IIn111+ 11111111,i11111II 11111111f 111111111 I ill1 111icontinue. Storage in the major upper basin reservoirs / • 1 ;III ;It1 i 11111111 I1111In1 t 1111111 111111111 111[11111 1 11111 1111i• . . I ill' 'In 1111111' 111111111I•1111111 11111111f 111111n1111,1111111 1111decreased slightly with the exception of Cheesman Reservoir a . IIIII,1I 111111111 11111Hl I IIIIIIII I'IIIIIIII II,IIII111 III,II <br /> i -, I 11'Isl � Ill .'III i iI'� <br /> which increased by 46,485 acre-feet. Storage in the upper ''1 <br /> basin reservoirs is at 89%of capacity. Precipitation was 87% s .3 <br /> of average for the month and was 98% of average for the a <br /> water year. Flow at the key gaging station,South Platte River .• <br /> near Kersey, averaged 652 cfs for the month as compared to J.wa JAMB. J Jam.2 <br /> • the historic monthly average of 734 cfs. The September peak w,l„„bill <br /> flow of 934 cfs resulted from decreased demand and irrigation <br /> return flows. Flow at the Colorado/Nebraska stateline <br /> averaged 335 cfs for the month. Several ground water <br /> recharge projects are now operating. <br /> }' SOUTH PLATTE RIVER NR. KERSEY <br /> Ouiiool[. 3.3 P10110.11A?rl TWF <br /> The streamfow forecast is for normal to above normal <br /> conditions throughout the basin. Irrigation and municipal ;:; <br /> water supplies appear to be adequate. Colorado-Big i '_ , <br /> Thompson Project water supplies improved and are slightly 4 1.8 <br /> better than last year. Denver discontinued diverting water <br /> from Dillon Reservoir via the Roberts Tunnel in late August ;=fa ,,, <br /> Approximately 30,000 additional acre-feet will be brought to <br /> the east slope through the Roberts Tunnel beginning in late I °-' <br /> tober. •.• <br /> Oa <br /> Administrative/Management Concerns: . �- E--• <br /> .•t 1W OW Am lea March Apr ll w Jima July •im bee <br /> The most senior River call on the South Platte River ,o,,,,l <br /> for the month was the Farmers Independent (11-20-1876) in "R`'"°' • �"`"`" • Me. 4 <br /> district 2 going into effect on September 5, 1991. The most <br /> junior call in effect for the month was the District 1 Ground <br /> Water Recharge right (12-31-1972) that went into effect on <br /> September 11, 1991. The interstate compact (South Platte) South Platte Bas I n Reservoir Supp I t es <br /> with Nebraska adjusts on October 15 annually, basically a.. - <br /> giving Colorado full use of the available stream flow. Up to a."- 7 <br /> Jr <br /> that date,flows at the Stateline (Julesburg index station) are ..° <br /> required to be 120 cfs. _ <br /> is,7-"/N <br /> Public Use Impacts: 1 ,,. <br /> Flow in the reaches of the South Platte River I I <br /> immediately below Spinney Mountain Reservoir and t '°° <br /> ../A -7 7 <br /> Cheesman Reservoir are at 65 cfs and 180 cfs, respectively. i .. <br /> The releases from Cheesman Reservoir will be further reduced '/A,„ <br /> .. A <br /> to approximately 50-75 cfs by November 1. a <br /> //. //!\\ .7\\. • r7771 r777 <br /> • <br /> of l,.. i t1Ul .lw4 W 1. .--. J.•.•1 .. taw <br /> ® are.vat wrist• ® snare,a•.a..r. <br /> 3 <br />