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<br />. contribute 5,0000fs, rather than the 3,950 cfs noted' above. Fin'aJfy,USGS cal'QU!ate~tl1e demi1W1t4is~#argc,
<br />(!)f, e1al\mldl"{@lT1liJil:g,d!i~ohar-ge; is 3;f:J0(i). 6,0(!JOe'fsan.d'betW~ej\):a!an.'cl. Hi)Y<ilai'eveat'{(rWCB,at(~~~ ' "
<br />t:999~, '. ' ' ' ' , ' . " " ,
<br />
<br />-The Roaring FO,rk River has a ~igtllfican.t fl00:dhi~tory.. FI00deY\\lntshaveoccU1f\\ld:216,ti:me~sinaet'~G1bl~~41edi
<br />Resel;V@irDam en the FryingpanR:1ver, Which begiUa (lpera'tiori.sID1968,haS)si$riiifican.tIyred'uced!t1te'~~ak
<br />floodilisohar-geson the lower RoaringFlilrk Riv~;hewevei:,fIl!r€..~il1rgsti44,ocl:)tirc&. ' '
<br />
<br />l'hemost'tetiel1ttlo@riEevent oceWredIDI995,ltf\d;itWasesl'jlttRlt1~,dtQ;be'a0ne.~~enty"fi.Vt1' Ye@'j~\9~i~V€llt
<br />inBasa1t. In, June an.d:July 19'95 ,llie'RoarlngFotkRivcr vllHey''e~perll'li1.Qe4fIo@1it1l1gfol1owingt11:e1\liL~tin~'lilf
<br />deepsnowpack of the winter. At AS):lcn;, the 1995 peak flow:of2:,Q3Dcfs 'Wll'sthe gjic'atest eX;):lerlelilc\'!ll11si.11ele
<br />1918 (ll'50 year event), .surpassingtlIeprevi()usfIo6d!pe;tkisil1t~S:o/, 199ilantl,1r9il~; .'l1!lawn~tfe~.IItt~l~~ljJod
<br />Springs, tHe 199$ peak flow of l'l,OOOcfsW<1$ the1li:ghest Pe.ak~o\Vsfi'loef901.JI~MMsive):lrObl\ints!~Ji>b~
<br />erosion andehanne!mlgration wereexperienced'tfuouy€!~tth'e'R'qanngF01;k ~aIle,y,',Ieirdfugto'.ll~git@,
<br />prqperty" rnfrastructu:re, and aquatican.d ripanllrllilibitat 'River l,1l&tl\!'lfI1ty was on:edfthenrqstdeJtl:i;lq~ve
<br />prqJ!>leniscontri)),i:ltirtgto tliet1:0'0dda:magesc '
<br />
<br />Pra):'lleins,pa)lse!ll:iy r995fJ:06d~ the'B'asalt ar.eaillP1u/;l'e'd:
<br />. E2l:tensJvedeposlti0n ofci\lbbles It/ld debITS atclre'UPPer:a:YfJass13ITdgelt/ld'Bl1llil~ 13rld~e;
<br />. Clianne! IT10vement downstream of the Upper:BypassB:ti~geresl/ltj:ngillsigtrincantbanke,tpsj~n Ei/'Jthe
<br />river right and a m<rjorwas1).eut on the roa~f (TwoRivers;~0~) tliatrU:nspat-a-lieHoth:eBank,
<br />. MinorJlooding at'Roaring'F@.IiR TrailerPatk, ,
<br />. Failttreofamajor bank stal:ii1i:zation andhabitatimpr6ve\flelltpr0jecti'/'lthe Uppet 13ypass1lti4~~ear.ea,
<br />. Flooding of Oxbow, deposition of bedload inQxblilwl\jNa11;!1el,andclosnre ofchanne!,
<br />. . UncontroHed releases over spilIwayat RuediR!eseWotr, which filli;Jd,
<br />, . Less of trees frem the riparian. lIteas.
<br />
<br />
<br />80ut]1"side flews Were effectively prevented by the leV'ee(s) previously installed on tneITver left,ups~emn0;f
<br />the Upper Bypass Bridge. However, theselevecs were damaged an.drequiredsubsequent re-building., The
<br />Sanitation Plant, which lies in the predicted floodway of theseuth-sidefloodplain, was censequentlyrrot
<br />fleeded. Drop structures installed in the maincha11;!1el upstream0fthe 8anitationPlailtsurvivedthe]!t)!()d,
<br />pessibly contributing to the success ofthe bean that protects the Sanitatil'1nNantfrom, flooding from,themain
<br />channel.
<br />
<br />Financilll Data
<br />
<br />The total project costaf $ I 2,70.0;0.0.0 (rounded) in Tllble 3eKce'i;Jclsthe Section Zo.6maldmUItl totalPf~~I;lt;C\i)st
<br />of$7,700.,.oOo.. Implementing this project UHder tlrisauthoritymayoccur if'theuon.Pederal SpbnSQfa~eeS to
<br />pay all ofwhatweuM have been Federal Costs in excessofthestafutory Federal fu.ti~inglirnit of$5,~~O;o.o.@. ,
<br />At 35percentnOIl"Federal and 65 percent Federalcostshare fofcosts up to, $7,700;00.0, the localspOh$()rwould
<br />pay $2,700.;00.0 as its 35 percent share and an additional $S,o.o.o;Ooo. for costs eXQeedirrg $7, 700;OOo.:1iJ.lttli>
<br />$ 12,70.0.;0.00. With the LERRDs estimated at $6,600.;000. (rounded), tHe bailance of$l, 100.,000. of~i1l!l~~
<br />Federalsliare would pay for the DPR, plailsand'specificationslUld of apomi€lJ:1 of C0J1sttuction. l'fl:eSM"l!~kllJ,OO
<br />balanoe shown as the non-Federal share during construction ir1clu'des reimbnrsementsforloca!sma11e.@lliitll:eN'PR
<br />and plans and specifications. The local betterment cost 0[$90(:);0.00. (ro'Qrrdedi)for rec;reatien facH'itiesdsshli>WIl
<br />as a separate item. The local sponsor isresponsiblefor 100% of annual operations andmaintenance
<br />"1I..F5,00.0/ye~), and these costs .ar: no~ cost-sharable;-vit~ the Fed,. eral governmen.' t. The non"!ed.eralshllfe of
<br />. totalpro]ect costs can be paId 111 drrect cash contributrons, tHe value ofLERRDs, and/or Ill-kind
<br />contributions (Table 4).
<br />
<br />
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