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<br /> () <br /> ,0 <br /> 0 <br /> 10 <br /> I 0 <br /> iO <br /> l <br /> '0 <br /> I <br /> '0 <br />I 0 <br />I <br />, () <br />I 0 <br />I 0 <br />I I~ <br />I '..7 <br /> C.. <br />I v <br />\ <br /> t"' <br /> '-, <br /> C <br /> 0 <br /> () <br /> C <br /> 0 <br /> <br />The 1914,1917, 1920, and 1957 events ;11'8 pd;,ad1y S"u'I'"i'lt "ld1e eli; 1921 <br />Bnd 1974 events were augcented by rainfall. The 1974 flow at Uayd~n is one <br />of the controlling floods on the envelope curve of historic flood peaks. <br />chart 4. This high peak flow is bplieved to have been causpd primarily by <br />rainfall on the non-snow covered areas between St~amboat Springs and Hayden. <br />The 1921 event is part of the general flooding that occurred throughout ' <br />Colorado as the result of snov,nelt augmented by the general rains on 4-9 <br />and 14-15 June. <br /> <br />Flow records on Fortification Creek are meager. Maximum flows occur <br />during the Knch-June period and result from snowLO!'lt or a c:o",bi.r:ation <br />of s'no"",elt 2nd rainfalL The highest recorded peak flo'..1 occurred on <br />23 March 1947 and was 841 cfs. Rainfall at Craig on this date was 0.15 i~ches. <br />There are indications that actual peak f10\.;s ;:(1)' hreve been hi.[.h"r due to ice <br />conditions c~using inaCCllrate gage r~~adings or overbank flo~s that ~ere ::Qt <br />~casurcd. A recent study by tlle Colorado State Depnrt2cnt of llig]l~ays <br />(Reference 1) reports the results of a slope-~rea co~putation based on a <br />recent high water L"ark (date unknown) on Fortifici1tion Creek. A ?e<lk 00',.,' of <br />1800 cfs ~as csti,;l2.tede Data pt'esc-:.nt:ed in -.r:cfercnc:e 2 indJcates that flocdi :lg <br />at Craig in the late 19!;0'5 "'-'as cau~Ed by ~:;pring th3~';>S and Jce ja,:1s :in the. <br />strcaQ channel. In 1949 the Corps of Engi:lccrs cOjJ~letcd ~scrg2ncy <br />"lork on FortifiCation Creek cor:sis t:Lng of ch,c~rHlel cnl.:1rgc:icnt 2.r!d <br />straiglltening and levee construction. As a rpsult of t}lis work, plus <br />subst3.11tiJl ch2nnel Gctr202.clon that h<15 occ,~l'red j_Il rt.~C(:ilt YC2rs, the <br />.ice j.3El probJe..-a is not 2S scy'crc n0".,.,78 D::f.scuss.ions t-rLth Iacel Jnteu::sts <br />.indicate that ice jams occur occ"sior:"lly ;.,t a se,.;cr line cro~osirIg <br />i.l]~cdiately upstre.;:~m from l'a~dl\la.y L,O .and at the D:ZG[,H R.:d.!.roz:u 'tela..., <br />Hir.h~ray 40 ond tZlat theSE: jar.ls are removed by city 3.nd r2ilroad <br />U'~:lin.tcnance crews. <br /> <br />There are no stream &2ges on tllC sDal1 tril)lltiiries to Fortification <br />Creek or on Pine Ridge Gulch. A gase was installed on Cedar VOlOnt<lin <br />Gulch in 1974. The largest reccrded flml "as 102 efs and occurred on <br />20 July 1974 as the result of a scalI thu<lderstonn. A s',lo;"o,elt flood <br />occurs::-cd on 26 }iarch 1971 on Cedar }lountain Gulch and 'caused floucl'ing <br />of SO~e residential property. Information provid2d by the Colorado <br />State Dcpart~ent of I{igh~ays (reference J) indic2tcs that ~atcr pOllded <br />behind liigh,,'ay lfO to a height al'ove the iZ" culvert but did nol: flow <br />over the top of tIle road. Based on this Ijl:litcd i]lfor:~~:=ioll it is <br />believed th~t the peak flow ~as bct~:ccn 200 ~nd 300 cfs. <br /> <br />The only thuiidcrstor;n to occur 1_11 the. Craig ;:;,rl',:l \./;lcre a ;~aLccl <br />strc.-jiilflow record is ~~v3j,1;!ble t.;i~S th~ ?O July 1974 C:Vt-:'J1t on C,-~d,J[, <br />NO\1Ilt.lin Gulch. A precipitation Z~IZC lOC<1t:cd at th':~ :,:~lrc;-:r;l .sage <br />recorded 0.45 inc110s of prccipitati()n in 2-1/2 }lours for this cvcrlt. <br />!;(:....'~[.',1pcr aCC011l:1ts ind:!.cate th3t t~JUlltier~~tol-,;;S have caused f.loodirlg in <br />Craig. A recent L'.\'ent of F<:rtjcul.-~r intcfc5t OCCUC:-CC on 7 /dlLl.~st 1970 <br />~,:l:cn 2.04 :f.uch~s of rain fell jn one 110ur ,-L1d c.iuscd sub~~~t::nLJ;;,l flo0,1:llg <br />.1 n Cr.-Ii g. <br /> <br />4- <br />