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<br />
<br />" " ' - ,".. ',' .,"
<br />~~l)fq~a,ii!t<~eofilo~p1l:aJ:l)gy. " The Roaril1gFork RiverDiseQt~'Bllsalt~n art area ",Mrefhe loe~t~e~l~~wartd
<br />teJ;l:e;g)!a}'Jla~"~oj!itl;t\\)'lIie'to,tiveFlilei!t ij!istllb~1iW. Upsllt~amlM'~\lS:~;ll'eciVer~J!l:eFlli)i)iY!mMS~1:l'_!;li,;&_\"
<br />dee,I\yi~!!'taeli~h:lUU1e'littsta1:>lege€l'logt(la1. fonn:atiolls;,Theaveragechlitl1Xel gtacleis(h 0il27 f.eetiJll:!lll,~(i)vartd .
<br />tltteeham.nel' wtdthisd:i~Ho:!.SO it. '
<br />
<br />, '
<br />. . " ,
<br />. I .
<br />_ :" ' " .. e)' .' .' . ~ .
<br />Mter:~~"t1l1:ougb:.$is ,deep'c~Y01'l;'st:eti0n;'at..apptoxMllat~~..two::mtle~m.1il1ljfte~.of~saI4.tlhiJ:$1l~ie~ .'
<br />\l~l1S~~;l~ltell. ,:$)y;t1l:et~.therivethllS;p~s~tao~sjfteam~':fIi<l\tasa'1t,'$l~'~ll~~Y,gIfad'$;has!de~~~;.~
<br />'O;00$:7'fe:etper,[oot. .CQnseq'llet1'tly"t1ixo'llgh'~asa1tt1i!erivcetvelocityslows,,_the:~e,d1oadQ;fcd1;l!Uit~S<~~t;fue
<br />t~V;eFhi$fellWIedi~(lug}i,ihe,u:ps~.earn..see'tipns;d!i:QJfs.out,CI'ea1!tt)i~lI'a'ar~~l!~g!;ll'("'lii~ltil.'vellbed[. '.'.~7~i3~jl~iJlg
<br />stl7eam'e1i.aIuiefthtC;l'llgh ~asaltisSigtli$icmttlY widet,'andtlie$~~r#lldh.l11iliettattge1linWitltl1.tlr\!\nj\;~~~f(;f>~~'O
<br />ft. . TheS~<l\Un chanrr~lisbraided"h.aving,a'b'ed'c()l1lP()sedl1los~Y',df.graVel,\,col1b!te~'!\Ul.dsmal1romrltl1'11lC;l'\\it41~s
<br />6tC;lrH\\1~h.lnUranteter. , l'Fter~are nranyn'ft'tes lll1<ft'<\piull'wi1ihtrtarl.Y shttll\'>wpo()lSllloliig.ltsel!l'U'l'~;'~~el!al
<br />imgatii()n~tches>divertiTom,theR()a1'ing ForkalQUgthisre,aclt. ."rn,.rtl()st'~e~s, ,tU.el~Meli~~Sat:'(j'r()\V,~~1l!
<br />ste,~stl!l)il~$i~Qftel:lllyer'4i5degFees),.'Weif.lgc()niPdS~'l:l'lC;lsIiY'()1I'~mr4,grlr\!el;.~dc~~les"with1i1111e'()~~o' '
<br />vegetrlJ,tr.l$11cOelowij;e.meanlUln'q'al1\!>ghwatelitiUWk. . 'rhe'ilt'eep:slli)pes'~drlacK'ofvegetation re,d)1<l(;}fl'.le
<br />Iiesi.stllitc'e()f.theb~s to,'SO\l!Ul:; ,
<br />
<br />1lhecd~Jji'les'l!J;el!los.lte\iinthestreamehmmelllJrel'eadtly~()ve<:ti~l)igpyetc!leityfl!6Ws, cteatiugail;'~~'Il'le .'
<br />rlvellb\!d.wnC;lse corlfigurl\.tion ca:nchlli:\gedtarnafical1y;ft'om:Olile.1t1gMI.\1wt;lventt@the'uext. 'R'eceli!.t;!I~~a '.
<br />eventsm 'J;~S~,,'1984,,',1'9S~;,. an:il.I99Ss'i:gnlfi:01\ritlyltlte'l'eltc1ia.mt(jjf'll'l'i'grllileti't,an:&~~e'irial1dMb:tl:ti~f~il~t.
<br />'Phe'},1fmtf,;(ijfjjecti,ve"Plal1l'ting'S.tutlY.fCWCEJartd':J.tWIPcA,19%tJJfdefu:dhstrlJ,tedthatffie'.ldw.,fl\:):w,.<tl'I,~'\IIt:~
<br />aetllalto/'1lligJiatedoutsid.e ofth.eprev10usLydetlned. FiBMA IQ'O,,~ellJrtlQO'd.pta:irt ih$.omeafeas. Ckattti(j!J
<br />instability is a signi1ficartt feature oftlleproject reallh. '
<br />
<br />Dlil\vnstJ!eam of Basalt, the river gJiacJientde(lrea$esfu1'ther{t~ afl'pl'oximately:O:007 feet per fo(jt'),:jj~!th.e#ver .
<br />tlowsft1lr,C;lugh another deeply incised channel In amC;lrestabt~gedl()gl.calfonn:ation. Consequen1!ly, :if!.e '$.ta1'liliw
<br />C;lftheriverdownstrearn o[Basalt is improved lll1d.channel instabilltyap.dhabitat degJiadation is WssO'fa '
<br />plioblem.
<br />
<br />I'J:ydrlllllgy. TheJo1towing flows ate the current design. flood flows for the Roa1'ingFork.
<br />Table 2. Design FloC;ld Flows fortheRloa1'ing,Fotk Rivet
<br />
<br />Strealnl{each
<br />
<br />
<br />'~rooWPellk$lir,cfs.ForJ')lffel'eiltReturli
<br />Ihtelwals
<br />
<br />P'." ;rJ;i11,iv.er, above :aas1!l.t
<br />Roarln.gPork~yeI,aboYe
<br />Fan:Ri'Ver"
<br />Ro.mng)"orkRiver,aboveSopris S'50
<br />Creek, below PI' @River
<br />Roaring1'lilrk river, above
<br />Garfield County Une, be1lilw
<br />So Fi$ (;r,ee1<:
<br />Source: USACEstudyvalu.espublislrediinFloodHazardReperts. , , '
<br />*Peakdiiseharges were taken from Floodplainfuf0nn:ation Report, Roaring FotkRiiver, WrighVt~1\l1.lj;\tghlin
<br />Engineel's, 1~76.
<br />
<br />
<br />498
<br />510
<br />
<br />!O~ "
<br />4~SP
<br />6;160 '
<br />
<br />
<br />7;tOcr
<br />
<br />9;400
<br />
<br />IO;<l!OO
<br />
<br />14,300
<br />
<br />870
<br />
<br />,7,300
<br />
<br />9,800
<br />
<br />10;800
<br />
<br />14,700
<br />
<br />Thecenmbu.tiC;lnof flow from the hills south,ofBasa1tdurl~g a 1 OO-yearfloQd is estimated at 1;0elO'd$, It is
<br />also assumed that ifRuedi Reservoir (operational in 1968) did not withholil water, the Fryingpan would
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<br />L:\Sectlon Folders\SECAlBoard Meetlngs\September 2002\Agenda Item 19-Corps report allachement.doc
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<br />09/03/2002 PM
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