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• <br /> SOUTH PLATTE BASIN <br /> SURFACE WATER SUPPLY INDEX <br /> 5 South Platte R1vr&Min <br /> Basinwide Conditions Assessment: <br /> 4 <br /> The SWSI value of -0.6 indicates that the current - " <br /> La conditions are slightly below normal. Reservoir storage is '- <br /> the key component in this basin in computing the SWSI 2- ' r —'• ''' ;f`"`` <br /> value and was 110% of normal on January 1, 1991. j 1- - 1` ._ <br /> Precipitation was 86%of normal for the month of December. 0 0 1A �-- - I fr.- <br /> Basinwide snowpack is 72% of normal and only 70% of last � `� <br /> year. The major diversions of water are now going into <br /> storage structures. Combined storage for the month of o "2- <br /> December in the lower basin reservoirs, including Julesburg -3 <br /> Reservoir,North Sterling Reservoir,Jackson Reservoir,Empire -4 , <br /> JAN21 JA1422 JANB3 JAN54 JAN25 JAN9i JAN133 JAN99 JAN2111 JANI20 JAN91 <br /> Reservoir, Riverside Reservoir, and Barr Lake Reservoir , <br /> YSkii <br /> amounted to 26,991 acre-feet Eleven Mile Reservoir was at <br /> 100% of capacity with 98,630 acre-feet in storage. • <br /> Cheesman Reservoir was at 75% of capacity with 59,355 <br /> acre-feet in storage. Releases from Cheesman Reservoir into <br /> the South Platte River are currently at 108 cfs. The majority <br /> of ground water recharge projects are operating at near SOUTH PLATTE RIVER NR. KERSEY <br /> capacity. Flow at the key gaging station, South Platte River 450 FUN SY WATER YEAR <br /> near Kersey, averaged 779 cfs for the month of December as <br /> 400 <br /> compared to the historic monthly average of 812 cfs. Flow <br /> ° <br /> at the Colorado/Nebraska stateline averaged 460 cfs for the <br /> .„,.......„.„„...,_:./ <br /> month. This is a significant increase over the average flow 3°° <br /> in November of 155 cfs. This is the result of irrigation a 2 250 <br /> return flows below Balzac and lack of lower South Platte ig „°- <br /> basin storage capacity. -� <br /> 1sa <br /> Outlook: ion <br /> The 90-120 day outlook is favorable. Snowpack in 2 ----- <br /> the upper reaches of the basin is below normal, but reservoir a <br /> levels basinwide are above normal. The scenario for water - act "°" Jan "° ''°r`" <br /> supply and demand appears to be normal. However, unless "'ET 1f61'c1 + YEAR� o AVG. a 19 <br /> above normal precipitation occurs in January through March • <br /> in the upper reaches of the basin, snowpack going into the <br /> 1991 runoff season will likely be 20% - 30% below normal. <br /> The streamflow forecast is lowest in the Boulder Creek <br /> drainage at 75% of normal and highest in the South Platte Sout n Platte Basin Reservoir Supp I i es <br /> rnainstem at 96% of normal. 260 <br /> 240- \7 <br /> 220 <br /> Administrative/Management Concerns: 2a°J/ <br /> River calls continue on the South Platte and its 1 1B0 <br /> tributaries. Calling rights generally switch from direct flow §„ 1130 A <br /> uses to storage. The interstate compact with Nebraska !I 140 <br /> y\ . <br /> adjusted on October 15 basically giving Colorado full use of 120 <br /> available streamflow. The river call for District 2 (South , '°° <br /> 'V/A <br /> Platte River between Denver and Greeley) since November 3 <br /> 20 <br /> 1990, is the Horse Creek right (March 17, 1911 decree). The 2a /\ &\. // ' / <br /> river call for the South Platte River above Denver (District <br /> all Ion Hars.tooth Eleven MI to Chessman Jackson Barr LJk! <br /> 8) is the Denver South Platte River intake right (December . <br /> ® Avg. 12/31 Content. I\Q 12/31/90 Conta"ts <br /> 6, 1910 decree). <br /> 2 <br />