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<br />. <br /> <br />. <br /> <br />. <br /> <br />COLORADO WATER CONSERVATION BOARD <br />INSTREAM FLOW RECOMMENDATIONS - WATER DIVISION 5 <br />PRELIMINARY NOTICE OCTOBER 20,1995 <br />GRAND JUNCTION, COLORADO <br /> <br />STREAM WATERSHED COUNTY UPPER TERMINUS LOWER TERMINUS LENGTH USGS QUAD(S) AMOUNT <br /> (mile,) (ef,) <br />Colorado River Colorado Ri\lcr Mesa from Grand Valley confl. Gunnison River at IS Palisade, Clinon, .. See Below <br /> Irrigation CompElny lat 39 03 44N Grand Junction <br /> diversion ftt lon8 108 34 38W <br /> lat 39 06 06N <br /> lon8 10820 53W <br /> <br />'*' The Board intends to determine the Instream Flow structure and amounts at the October 20, 1995, Special Board Meeting in Grand <br />Junction, Colorado, <br /> <br />The United States Fish and Wildlife Service (FWS) has recommendedn) the following flows for the" 15 Mile Reach" of the Colorado River', <br /> <br />RcconuTlcndcd mean month!... flows for the too oflhe "15.Milc Rench" in cubic flIsec refs), Role Is (he percent of years that rhe recommended flows should be provided based on winter snoy,pack levels. For <br />e:rample. In {he werrest ]5% afthe years. flows in JlIne should average at least J 5.660 eft: stared another way. this recom",endaflon should be met I"five a/every 20 years. During low-water years, Jllne <br />.flows should average no less than 6,8.50 cIs, (lnd such a minimum should occurar a role olno more than -I in 20 years (20%). <br /> <br />Rnle <br /> <br />Exceed:Ulce <br /> <br />JAN <br /> <br />FED <br /> <br />MAR <br /> <br />APR <br /> <br />MAY <br /> <br />!UN <br /> <br />JUL <br /> <br />AUO <br /> <br />SEP <br /> <br />OCT <br /> <br />NOV <br /> <br />DEC <br /> <br />25'% 25% 1630 ]630 1630 3210 10720 Il660 7060 1630 1630 1630 1630 1630 <br />25% 50% 1630 ]630 ]630 2440 93S0 14210 l370 1630 1630 1630 ]630 1630 <br />30% 80% 1630 ]630 1630 2260 7710 11310 3110 1240 1240 1240 16JO 1630 <br />20% 100% 1240 ]240 1240 ]S60 7260 6Sl0 1480 SIO SIO SID 1240 1240 <br /> <br />FWS Recommended oeak flows in the" IS-Mile reach": <br /> <br />1) >23,500 cfs in at least five of every 20 years (highest 25% water years), <br />2) 20,500-23,500 cfs for those above average years with peaks <23,000 cfs (25%), <br />3) 12,900-20,500 cfs to occur with a frequency of no more than 10 of20 years (50%), - for these below average years, the minimum <br />peak of 12,900 cfs should occur in no more than 4 of every 20 years, i,e" the lowest 20% of water years, <br /> <br />a) RelatIonships Betwe~n Flow and Rnre FIsh Habitat in lh~ "I ~ Mile R~ach" of the Upper Colorado River, FWS (May 1995). <br /> <br />File " eolo_nv.p_nOi5kI <br />