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<br />Supplemental Information.
<br />Pa~t:Ecosyst/;lm Degradation. Several factors, contribute to ,the ongoing degradation.of the aquaticaJildbriparian
<br />habitat in t11e project reac11. Of primary importllnce.is the geologic instability of the river channel, dMtothe
<br />ab,senceofnatural geologic control fonnations,the,collfluenceoflheRoaringFork and the FryingpaJ:j€spri1tg
<br />flows can ris,e to 1,(1)00 cfs or more), the inherent instability of atluvialdepos"itS, and t11e sl1allow,graili1!1nt
<br />throttgh the town, This geologiC and geomorphic instabilityise~ac:erbat!ildby se;vera1trell..ds"infitllilJl'llit1!l~e8::lrd
<br />developrnentin t11earea. Constructionoft11e UpperE3Yi'ass Bridge'in 198'7l\1Iditsexpansion in 199'1
<br />effectively bifurcated the natural floodplain of the river in tJiatar~a, Bffoitsweremai'!e to ohanne'l~e:::l1!lDiW
<br />through the, mainc11annel, through town;> leadingtoe~tensivesc~ntFmgan~t'epeatedneedsto st<!b~iz(l1ilie
<br />channelbatlks with levees,controldikeSandbeliiiJs.cont!nujj;rg:l'!l;Jve10}lWel?tmilie:lil:ooap.lam~s(\).." '
<br />increasingly constrained flows to the c11annel(s) and increased flow velocities. This alsoledtorilarebll7i1k ,
<br />destabilization llndt100d damages. Construction ufirrigationheacl,gatesandmllnagemento:fthe stre!ttll!'&lIdtQ
<br />divert water to tl:1ose headgates also led to less stable channel coflli'guratlons. '
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<br />T11edestabiIization ofthe c11annel, c11annelizatl(m and increased flow veloiities, and erosion ofri"eFbiJ1Tks~
<br />contribute 10 increased sediment loads and turbidity ih t11e water: The diminished water qua1ity may iffi,.pltCl'the
<br />successof..fis11 populations. Degradation of the streambed also leads to loss of adequate physica111abitatfGl'tish
<br />_awning and rearing.
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<br />L:ISection FolderslSECAIBoard MeetlngslSeptember 2002IAgenda item 19.Corps report attachement.doc
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