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ARKANSAS BASIN • <br /> SURFACE WATER SUPPLY INDEX <br /> Arkansas River Basin <br /> 3 - <br /> Basinwide Conditions Assessment: <br /> - <br /> The SWSI value of +2.6 indicates that the current ,. <br /> conditions are above normal and is the highest value 3- T 4 - r <br /> computed for any basin in the state. Reservoir storage <br /> measured on January 1, 1991 was 122% of normal. - - = = == <br /> Snowpack measured 75% of normal on January 1, 1991. ° ti: r- <br /> Precipitation fol. the. month of December was 134% ofIt <br /> normal, but is 40% of normal for the water year. Flow at - <br /> the key index gaging station, Arkansas River near Portland, o -2- - <br /> averaged 292 cfs for the month of December as compared to -3 the historic monthly flow of 383 cfs. Storage in the upper <br /> reaches of the basin in Turquoise Reservoir and Twin Lakes `""'° '""°' J""' .L4N 5 JAMBS JAMB, JAHBB JAN9D JAH91 <br /> MONTH/YEAR <br /> Reservoir is approximately 50% above normal while storage <br /> in the lower reaches of the basin in Pueblo Reservoir and <br /> John Martin Reservoir is just slightly below normal. Usable <br /> storage in Pueblo Reservoir was 110,000 acre-feet on January <br /> 1, 1991. Usable storage in John Martin Reservoir was <br /> 33,000 acre-feet on January 1, 1991. Winter water storage ARKANSAS RIVER NR. PORTLAND <br /> 750 FLOW BY WATER YEAR <br /> increased by 85,932 acre-feet between November 15 -January <br /> 1, 1991. The total amount of water stored under this 140 <br /> program last year was 129,584 acre-feet. ,2 <br /> 1,0 <br /> Outlook: ,00 <br /> The 90-120 outlook is for normal to above normal 8. <br /> '° <br /> ti <br /> water supplies. Available storage capacity remains adequate B° <br /> in the lower basin to compliment normal to above normal <br /> runoff. The streamflow forecast is highest in the Cucharas <br /> River drainage above La Veta at 115% of average to a low of •O <br /> 88% of average on the Arkansas River above Pueblo. <br /> 20 <br /> Oct HpY Dec Jan Feb moron <br /> Administrative/Management Concerns: SET YEAR C,gs,, oRr TEAR WikTH <br /> ,gam o AVG 199 <br /> The winter water storage program runs from <br /> November 15th through March 15th. The call on the <br /> Arkansas River mainstem will be March 1, 1910, throughout <br /> this period. <br /> Public Use Impacts: Arkansas Basin Reservoir Supplies <br /> Water based recreation at Pueblo Reservoir and John 140 <br /> Martin Reservoir is expected to improve for the 1991 season.• 120- <br /> 11Q- <br /> 100- <br /> w / \ <br /> 8 80 <br /> 40 <br /> 3020 <br /> 10 <br /> Jonn►frtln PUe0Io Turquoise Twin LAkee <br /> ® Avg. 12/31 Contents ® 12/31/90 Contents <br /> 4 <br />