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<br /> ARKANSAS BASIN
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<br /> Basinwide Conditions Assessment:
<br /> The SWSI value of -2.1 indicates that the overall SURFACE WATER SUPPLY INDEX I
<br /> ver Basta
<br /> conditions are below normal. Snowpack measured 79% of S """"'p`
<br /> average on March 1, 1991. Precipitation for the month was .-
<br /> 88% of average. Flow at the key index gaging station, r r ,, t
<br /> Arkansas River near Portland, averaged 423 cfs for the month 3— - 1. :'t -
<br /> as compared to the historic monthly flow of 331 cfs. 2 •— •
<br /> Reservoir storage measured on March 1, 1991, was 123% of 1 '- : C F C
<br /> average. Storage (total) in the upper reaches of the basin in i a .r, ,,_ --' _ .._ IL�-- r �-
<br /> Turquoise Reservoir and Twin Lakes Reservoir amounted to _,- - - ; I r ;�- 1
<br /> 214,113 acre-feet. Winter water storage increased by 132,198 2 ; ;
<br /> acre-feet between November 15, 1990, and March 1, 1991. . =
<br /> This represents a net increase of 29,989 acre-feet for the "'-
<br /> month. The total amount of water stored under this program -
<br /> JANl1 JANUS JAN113 JANU1 JANOS 40100 JAN17 JANUS JANUS JANUS JAN21
<br /> last year was 129,584 acre-feet. Dry and warm conditions on ,,°,,,„,7,A„
<br /> the eastern plains has created a deficiency in soil moisture.
<br /> Outlook:
<br /> Poor low elevation snowpack conditions are likely to
<br /> result in diminished early runoff. The strearnflow forecast is
<br /> highest in the Huerfano River drainage at 106%of average to ARKANSAS RIVER NR. PORTLAND
<br /> a low of 68% of average on the Chalk Creek drainage. ,50 P`°"we roam"6"'
<br /> Streamflow forecast for the Arkansas River above Pueblo 1,a
<br /> Reservoir is 72% of average. "°
<br /> 120
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<br /> I 110
<br /> Administrative/Management Concerns: g R „°
<br /> The winter water storage program runs -from a i 5,5 -
<br /> November 15th through March 15th. The call on the dt b
<br /> Arkansas River mainstem will be March 1, 1910, throughout
<br /> this period. The Office of the State Engineer is cooperating I `°
<br /> with the U.S. Geological Survey - Water Resources Division,
<br /> the Southeastern Colorado Water Conservancy District, and
<br /> the cities of Pueblo and Colorado Springs in conducting a
<br /> ort Nov Doc .Jan Fab trCn
<br /> water quality baseline study on the Arkansas River. The study ,.,,,,t
<br /> C1284)is primarily concerned with delineating heavy metals ° "°' ' ORY(1°"' A 1991
<br /> concentration and dissolved solids at varying flow rates.
<br /> Public Use Impacts:
<br /> Water based recreation at Pueblo Reservoir and John Arkansas Basin Reservoir Supplies
<br /> Martin Reservoir is expected to improve for the 1991 season. 1.0
<br /> Above average storage in the upper basin reservoirs,Turquoise ;o_ %//
<br /> and Twin Lakes,will be beneficial as water transfers to Pueblo -
<br /> Reservoir during the summer months will enhance recreation ,a,-
<br /> on the upper reaches of the Arkansas River. + 1.5-
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<br /> tj 75 A N.'
<br /> John~tin Ps0IA TVa.GIsa T.in Laksa
<br /> ® Avq. 2125 Contents ® 2/20,91 Contents
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