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ARKANSAS BASIN December, 1997 <br /> Basinwide Conditions Assessment: 1 <br /> The SWSI value of 2.6 indicates that for November the ARKANSAS RIVER BASIN <br /> basin water supplies were above normal. The Natural 5 Surface Water Supply Inosx History <br /> Resources Conservation Service reports December 1 snowpack 4 <br /> as 169%of normal. Flow at the gaging station Arkansas River <br /> ui 3- <br /> near Portland averaged 513 cfs, as compared to the long term a : , . <br /> average of 441 cfs. Storage in Turquoise,Twin Lakes,Pueblo, 2- '4-.4- - r I - <br /> and John Martin reservoirs totaled 233% of normal as of the I 1- . , - . ot *--.--. - - lm� -� <br /> end of November. g .r. <br /> , — ,. I~ <br /> The rainfall at Pueblo continues to be above normal, - -1• ' i r 1 ; ' <br /> with 14.02 inches having been received during the calendar _ . <br /> a - <br /> year compared to a normal of 11.02 inches. • 2 <br /> ti <br /> Current native river flows on the mainstem are 3 <br /> approximately 475 cfs above Pueblo,and 1,300 cfs at the gage 4 <br /> JANBB JANB9 JAN90 JAN91 JAN92 JAN93 JAN94 JAN95 JAN96 JAN97 <br /> near Las Animas (the inflow to John Martin Reservoir). These I, {,YEAR <br /> flows are producing a mainstem call of 12-14-1948, which is <br /> the John Martin Reservoir call (Colorado-Kansas Compact). <br /> Administrative/Management Concerns <br /> John Martin Reservoir's expected spill has not yet ARKANSAS RIVER NR. PORTLAND <br /> occurred due to filling of off-stream reservoirs above John 155 FLOW BY WATER YEAR <br /> Martin during the last three weeks. These reservoirs,with one 140 <br /> exception, are now full and a physical spill of John Martin is 130 <br /> expected during the second week of December. Once this spill „o <br /> begins, the Fryingpan-Arkansas Project's east slope storage if, 1QQ <br /> rights will be allowed to begin to store water in Pueblo o f 90 <br /> ag <br /> Reservoir. 2 BO V. <br /> r 70 <br /> i'S BO <br /> 50 "(--7‘ <br /> 40 <br /> 30 <br /> 20 <br /> Oct Nov Dec Jan Feb !larch <br /> MONTH <br /> O WET C1984) p DRY C1977) G AVG X 1997 <br /> REPRESENTATIVE RESERVOIRS <br /> Arkarnaa River Basin <br /> 350 <br /> am- \ <br /> `' 250- <br /> M <br /> n 200- <br /> W t- 150- <br /> Nu <br /> o <br /> 10Q- \ \ <br /> 50 / \ /\ / \ \ <br /> . /;,, ,,-,\ ..-\\ <br /> John Martin Pueblo Turquoise Twin Lakes <br /> ® Avg 11/30 Content. L2s1 11/30/97 Contents <br /> 4 <br />