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• r <br /> ARKANSAS BASIN June, 1998 <br /> Basinwide Conditions Assessment: i <br /> The SWSI value of -0.7 indicates that for May the ARKANSAS RIVER BASIN <br /> basin water supplies were near normal. Flow at the gaging 5 - - SIr1.ee MaL•r Supply Index Ni.tory - <br /> station Arkansas River near Portland averaged 735 cfs, as ,- <br /> compared to the long term average of 1,144 cfs. Storage in ,_ 3_ <br /> Turquoise, Twin Lakes, Pueblo, and John Martin reservoirs ' ' �'1. <br /> totaled 200% of normal as of the end of May. M--�- _ . •--1.0_ . [. = <br /> The early June snowpack in the Arkansas basin is y. r '�it a-� : , • <br /> 97% of average. The snowpack for the whole basin had 1 �v V --. - ,,ii <br /> t <br /> remained very dose to average throughout the winter season. - v r ,, <br /> As of early June the current native flows of the Arkansas River ; ' \ ' - ill <br /> at the index stations above Pueblo are around 2,200 cfs and o __2 . <br /> are increasing at the rate of 100 to 200 cfs each day. "3- <br /> JANBO JAN90 JAN91 JAN82 JA813 JAN9+ JANOS JAN95 JAN97 JAN98 <br /> Outlook MCNTw,EAR <br /> Indications are a fairly normal runoff season will <br /> occur on the main stem which includes a typical peak flow <br /> occurring near June 15. <br /> Administrative/Management Concerns ARKANSAS RIVER NR. PORTLAND <br /> While small scale flooding is typically a concern this i FLOW err WATER YEAR <br /> I <br /> time of year, no areas in the Arkansas basin appear to be of 0.9 . <br /> particular concern this season from snowpack runoff. 0.8 <br /> Thunderstorms are an unknown factor in producing flood <br /> events. 0.6 <br /> s• <br /> � <br /> o_ 0.5 .- <br /> Public Use Impacts .5 <br /> Given the likelihood of a near normal water supply s v ` <br /> season,adequate irrigation water supplies should be available 1 0.3 ' r <br /> to the more senior water rights in the basin. 0.2 • <br /> Both John Martin and Pueblo Reservoirs have begun 1 <br /> to be drawn down which does have recreational impacts. a <br /> Oct Nov COP Jen Feb Mfrch Aar I Way June July Aug S.pt <br /> John Martin Reservoir is currently being lowered by irrigation worm! <br /> demands in eastern Colorado and releases to irrigators in ° '�`73`' 9 aNr{1977) a AVG x 1998 <br /> Kansas,although conservation storage is still 95%full. Pueblo <br /> Reservoir has been drawn down significantly for both dam <br /> safety reasons and pre-runoff irrigation demands, with its <br /> current conservation storage at 86% of the restricted storage REPRESENTATIVE RESERVOIRS <br /> maximum. 340 ARKANSAS RIVER BASIN <br /> 320- <br /> 280- <br /> 280 <br /> 260- <br /> = <br /> J <br /> z4a- \ <br /> i 200—220- <br /> .i <br /> . <br /> • <br /> 180- <br /> h2 180— / <br /> ail r~i 1+0— / <br /> • 120- \ \ <br /> 100- <br /> //N <br /> 8D0'V// <br /> a \\ /\ /\ // \ <br /> John Ll rt1n puoblO TurquIra Twin Lalc•s <br /> ® Avg.5/31 Content. ® 5/31/96 Content! <br /> 4 <br />