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<br />O[J0829 <br /> <br />AaIph ......- <br />Cl>aInnan, <br />Irnplernentation ComrnInee <br /> <br />~UPp.erCOloradO River <br />. Endangered Fish <br />Recovery Program <br /> <br />ROO<<! MuIh <br />Director,- <br />"R"ecovery Program <br /> <br />SEP - 2 2003 <br /> <br />~~:~~. <br />SeP 042003 . <br />QA'lS <br />PfU <br />CNTR. <br />FlCJl. <br /> <br />U.5. F.... and WDdDfe ServIce . p.o. Box ~S4ae . o.r....... Fedtlral Cerdar . """"", co 8CI225 . (303) 969-7322 <br />. ESICO River Recovery Program\FY -03 <br />. Floodplain Restoration . <br />Mail Stop 65115 <br /> <br />Mr, David Fox <br />Colorado Division of Parks <br />P.O. Box 700 <br />Clifton, Colorado 81520 <br /> <br />INITIAl <br /> <br />E <br /> <br />-'.' . fIl <br /> <br />Dear Mr. Fox: <br /> <br />. r <br /> <br />...---' <br /> <br />Thank you for.your comments on the flooplain habitat restoration project at the Ela Wildlife <br />Sarictuary. Tetra Tech ISO, Inc" has prepared a fonnal response to your comments and concerns, <br />The proposed project will not change the flooding potential on adjacent properties. .Water will <br />still back up into the Ela Sanctuary ponds from the.boat tamp approximately every year, and <br />water will come over the existing low spot in the levee when flows an: greater than the 3-year <br />. return flow. The river already overtops the entire levee when flows are gieater than the 5-year <br />returo flow. With the new notch in the levee, water will begin to flow through the notch at the <br />same time that water is backing into the ponds from the boat ramp. . <br /> <br />Under existing conditionS, some sediment deposition likely occurs at the boat ramp as water <br />backs into the ElaSanctuary during spring runoff. An upstream levee notch is not expected to <br />result in any additional sediment deposition. . . <br /> <br />No scouring ~5 anticipated at the boat ramp as a result of the levee notch. The baekwater effect at <br />the boat ramp, and the topography and. vegetation between the notch and the outlet are expected <br />to reduCe velocities through the Ela Sarictuary ponds before getting to the outlet. <br /> <br />If, however; any unexpected problems do occur that are directly 'attributable to the notch i~ the <br />levee, then the Upper Colorado River Endangered Fish Recovery Program will take the <br />appropriate corrective action. <br /> <br />~incerely. <br /> <br />.fll--rr~ <br />lt~;~urfr1r~t~ <br /> <br />Upper Colorado River Endangered Fish Recovery Program <br /> <br />CC: See following. page <br /> <br />ColoradO River Energy Distributors Association. Colorado WlltlN' Congress. NatIonal Park Service. State 01 Colorado <br />State 01 Utah. State of Wyoming. The Nature Conservancy. U.S. Bureau 01 Reclamation. U.S. Ash and Wildlife ServlCtl <br />Utah Wa1er Usars Association .. We.18m .A.rea Power .A.dmiristration. Weslam ResourC!l Advocates. Wyoming Water Association <br /> <br />8 <br />