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• <br /> a <br /> • <br /> ARKANSAS BASIN <br /> Basinwide Conditions Assessment: I <br /> The SWSI value of +0.2 indicates that the overall SURFACE WATER SUPPLY INDEX <br /> Begin <br /> conditions are near normal. Snowpack measured 75% of Sk"'em`River <br /> average on June 1. Precipitation for the month was 131%of ._ <br /> average and 105%for the water year. Flow at the key index W 3_ <br /> gaging station,Arkansas River near Portland,averaged 826 cfs e 2 a..- - ;- <br /> for the month as compared to the historic monthly flow of 2~, ,_ ... ,- = ._ - <br /> 1144 cfs. The Bureau of Reclamation has been transferring 1 1- - -; - ' . <br /> , . ,-. <br /> project water from the upper basin reservoirs to Pueblo i ° =' L... <br /> "/-(111- <br /> -�P ] _ <br /> 'i <br /> Reservoir to make additional storage available in the upper _ <br /> basin. Averages daily releases amounted to 170 cfs from May ` <br /> -2- ; <br /> 1 to May 18. Releases averaged only 5-6 cfs throughout the <br /> remainder of the month. As such, actual native flow at this -3- <br /> station averaged 725 cfs in May. Runoff has been low due to <br /> JAN/2 JANL/3 JANH JAN85 JANt6 JAN87 JAN/l JAN89 JAN90 JANp1 <br /> cooler than normal temperatures. Reservoir storage measured gym. <br /> on June 1, 1991, was 123% of average. Storage (usable) in <br /> the upper reaches of the basin in Turquoise Reservoir and ' <br /> Twin Lakes Reservoir amounted to 116,500 acre-feet. Pueblo <br /> Reservoir had 150,000 acre-feet (usable) in storage. The <br /> Great Plains Reservoir has no active pool (usable contents). ARKANSAS RIVER NR. PORTLAND <br /> A late snowpack runoff has resulted in some early reservoir FLAY WATER YEAR1 <br /> releases. °'9 <br /> 0.8 <br /> Outlook: 1 0.7 <br /> The streamflow forecast is highest in the Purgatoire i0.6 _ <br /> River drainage above Trinidad Reservoir at 110% of average; o °s . <br /> a low of 77% of average occurs in the Upper Arkansas River ; °. <br /> drainage. Water users will be holding their reservoir water as <br /> long as possible by meeting early demands with direct 0-3 <br /> diversions of native flows. Irrigation releases will be made in 0 <br /> '2 <br /> late summer to supplement low flows. The snowmelt runoff 0.1 <br /> is expected to peak June 12-15. ° <br /> Oct Now one Jan Feb Morel, Aar II May June July Aug Seat <br /> MONTH <br /> 0 •L:T(19/4) + CRY c'1977, a AVG a 1111 <br /> Administrative/Management Concerns: <br /> The U.S. Bureau of Reclamation revised estimates of <br /> Fry-Ark yields of transmountain diversions into the Arkansas <br /> basin to 65,000 acre-feet in 1991. The Kansas vs. Colorado <br /> trial regarding the Arkansas River interstate water compact is Arkansas Basin Reservoir Supplies <br /> in recess until January, 1992. 150- --_----- <br /> 30- • l <br /> 1 <br /> 20- <br /> Public Use Impacts: 120- <br /> Water based recreation at Pueblo Reservoir and John i - <br /> Martin Reservoir is expected to improve for the 1991 season. <br /> in �- <br /> Above average storage in the upper basin reservoirs,Turquoise I .- <br /> g PP q a a 2 <br /> and Twin Lakes,will be beneficial as water transfers to Pueblo / <br /> Reservoir duringthe summer months will enhance recreation 30 <br /> � <br /> the upper reaches of the Arkansas River. The Bureau of t ,0 <br /> on pp /\� f \ <br /> Reclamation has committed to maintaining 700 cfs at <br /> Wellsville through August 15 by releases from Twin Lakes,up 10 <br /> to a maximum of 10,000 acre-feet. ° <br /> John LKrtln Pueblo Turauolsa Twin WE. <br /> ® Avg. 4W31 Contante ® 5/31121 Contents <br /> • <br />