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<br /> ARKANSAS BASIN
<br /> t
<br /> Basinwide Conditions Assessment:
<br /> The SWSI value of -1.0 indicates that the overall SURFACE WATER SUPPLY INDEX
<br /> conditions are slightly below normal. Snowpack measured 93% "r`"""' ""r
<br /> of average.on April 1, 1991 and is 143%of last year. Snow water 4- ' ,
<br /> equivalency is approximately 10.5 inches. Precipitation for the W 3- L r }?� 1 / I i
<br /> month was 128%of average and 104%for the water year. Flow -2 �,.: -,,
<br /> at the key index gaging station, Arkansas River near Portland, _ _;; ; - =
<br /> averaged 403 cfs for the month as compared to the historic ° , 1
<br /> w,. 1
<br /> r',�'
<br /> monthly flow of 333 cfs. Cumulative flow at this gaging station ; I 1 1 i It '
<br /> is actually ahead of the record flow measured in 1984 due to ''
<br /> ti i
<br /> early runoff from above average temperatures. The snowpack o -2- _ `
<br /> runoff hydrograph may have its peak moved earlier than the -3
<br /> usual June 12-15th period. Reservoir storage measured on April _. ,,.. .,.....,,
<br /> 1, 1991, was 131% of average. Storage (usable) in the upper J""" -Apia �""" J""" J""',p„,,,, `N�`"°' '""" J""'° J""
<br /> reaches of the basin in Turquoise Reservoir and Twin Lakes
<br /> Reservoir amounted to 143,600 acre-feet. Winter water storage
<br /> amounted to 144,625 acre-feet. The total amount of water stored
<br /> under this program last year was 129,584 acre-feet. Improved
<br /> soil moisture conditions may cut irrigation demands and delay ARKANSAS RIVER NR. PORTLAND
<br /> VSAN
<br /> reservoir releases.
<br /> 190
<br /> 140
<br /> Outlook: /30
<br /> The streamflow forecast is highest in the Huerfano River I "°
<br /> drainage at 125% of average to a low of 82% of average in the ;;�
<br /> Upper Arkansas River drainage. Runoff above Salida on the it 90
<br /> Arkansas River is projected to be 260,000 acre-feet as compared !u-
<br /> to the 25-year average of 310,000 acre-feet, Water users will be „ Z---------------
<br /> holding their reservoir water as long as possible by meeting early m
<br /> demands with direct diversions of native flows. Irrigation releases
<br /> 30
<br /> will be made in late summer to supplement low flows.
<br /> Oct — . J.n qp 9♦ren
<br /> Administrative/Management Concerns: ° 9iT(1994) + Cf0(1977) 0 AVG e 1991
<br /> The river call went to April 15, 1884,on March 15, 1991,
<br /> adjusting to December 3, 1884 on March 17, 1991, the Ft. Lyon
<br /> #2 right (March 1, 1887), March 18, 1991, the Ft. Lyon #1
<br /> (March 15, 1884) on March 26, 1991,the Catlin right(December Arkansas Basin Reservoir Supplies
<br /> 3, 1884) on March 27, 1991,and the Ft.Lyon#2 right on March 170
<br /> 10—
<br /> 30, 1991. The U.S. Bureau of Reclamation estimated Y.�7-
<br /> transmountain diversions into the Arkansas basin at 60,000 acre- 140- j/\ "
<br /> feet in 1991. The Fountain Underfloor System which has been a I 190-
<br /> + 110-
<br /> major concern of various water users in the Fountain Creek � a.-
<br /> drainage was toured by the Division 2 office and interested ii '°-f //\
<br /> �•
<br /> parties on December 7 1990. As a result of that field L
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<br /> reconnaissance and water right study, the Division 2 office has m f
<br /> prepared a Plan of Administration (POA) for the Fountain
<br /> wA
<br /> Underflow System and associated structures. This.plan clarifies 10 A
<br /> /\
<br /> how, and when, and what water right structures may be used °
<br /> pursuant to the existing decrees. The required measurements of Jon°'`rt`° ""°" Tor°"°"'
<br /> this POA should assure that no senior water rights are injured ® Avg. 3/31 ® 3/31/91 Content*
<br /> and that the Pinon gage flow is properly adjusted to reflect all
<br /> water past that gage.
<br /> Public Use Impacts:
<br /> Water based recreation at Pueblo Reservoir and John Martin Reservoir is expected to improve for the 1991 seas
<br /> Above average storage in the upper basin reservoirs,Turquoise and Twin Lakes,will be beneficial as water transfers to Pueb_..
<br /> Reservoir during the summer months will enhance recreation on the upper reaches of the Arkansas River.
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