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<br />(:f} <br /> <br />r<eea Harrls <br />I-'age :5 <br />July :l~, .I.~~U <br /> <br />~ll a.l.ternatlves identifled to date aepend on the availaoility of water <br />from acti.ve storage i.n NaVajO Keservoi.r. ::iucn water may be available <br />for testlng, experlmenta.l. f.l.ow reglmes, anD/or for .Long-term <br />maintenance of riverf.Lows in the ::ian Juan Kiver. Tne availaoility of <br />l~avaJo Keservolr water for tnis purpose should oe verifiea. we oelieve <br />tnat releases of water from I~avajo r<eservolr WOUlD almost certainly be <br />of oeneflt to tne flsn, but the extent of oenefit will DepenD upon tne <br />volume of water releasea, ana tne timing of tnat release relative to <br />f .l.OW Condltlons. It is not pOSSible unDer current circumstances to <br />glve Defwltlve answers as to now mUCh water SnoulD De releaseD, at <br />wnat .l.ocatlon,or at wnat ti.me. <br /> <br />we recommenD a number of Different researCh activities oe unDertaken ln <br />oraer to ootain information Wnlcn Wl.l..I. a.l.low ennancement of flows, ana <br />lll-provement ln naoitat. uovious.l.y, any researcn program snoUlD inclUDe <br />perloaic assessment of test flows, or of non-flow a.l.ternatives, to <br />aetermlneD tne aegree of success, or cnange. <br /> <br />;. <br />~ <br />-;; <br /> <br />~,; <br /> <br />we 00 not oelieve tnere is a aefinltlVe answer to question number four <br />at tnis tlme. Tnere are a numoer of questions wnicn must De aDDresseD <br />Defore an answer to questlon numoer four can De given. These inclUDe: <br /> <br />1. Tne effect of release of water from Navajo Heservoir on squawfisn <br />reprocuction, ana on naoitat availabllity. <br /> <br />2. <br /> <br />::iome releases are now maDe from Navajo Heservoir to support the <br />tailwater trout fisnery below tne dam. ADditional research <br />shOulo De unDertaken to Determlne wnether tne mlnimum f.l.ows <br />provloeD for trout During tne wlnter coulD be mocified, thereby <br />enaD.I.lny greater releases of water from the reserVOlr in the <br />spring for the benefit of endangered fish further downstream., <br /> <br />ti <br /> <br />3. <br /> <br />t"ive Dlverslon oarriers between ::ihiprock, I~ew Mexico and <br />t"armington, I~ew Mexico, prevent movement of Colorado squawfish <br />upstream. Hesearcn ShOuld be Done to determine whether these <br />barri.ers can be mooifi.ed or removeD for tne benefit of the fi.sh. <br /> <br />t~ <br />(H <br />~~ <br />1~ <br />" <br />t." <br />[.. <br /> <br />4. <br /> <br />l.:omparisons need to De maDe as to the relative abunDance of <br />Uoloraco squawfisn in tne ::ian Juan Hiver, compareD to otner upper <br />basin rivers. <br /> <br />el; <br />~ <br />'I; <br />~ <br />~, <br />~~ <br />.:~ <br /> <br />,. uetermine tne extent of oaCkwater or nursery nabitat available in <br />.Lower ::ian Juan for (;::i ana KLd YUY. <br /> <br />6. uetermine spawning sites, C::i larvae proDuction, ana loss of <br />larvae to Lake Powell. <br />