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<br />APPENDIX A
<br />
<br />CORPS OF ENUINl.'ERS LETrEffi R.EPORT
<br />
<br />U.S. AR.:\-IY ENGINEER DISTHICT\ Los ANGEl.ES,
<br />CORPs OF ENGINEERS,
<br />Los Angeles, Calif, July fJl, 1959.
<br />
<br />Refer to File No. SPLGP-F.
<br />
<br />JIll'. R. .J. W ALTm, .r r.,
<br />IJirector. Region, 7, U.S. Bll,rea.I/, oj Realmnatirm.,
<br />Denver FerleralGenter, Denver, Colo.
<br />DEAlt MR. 'VALTER: Reference is mude to your letters of May 15
<br />anu .June HI, 10l)!), re-Iating to the Burea..u of necJamatioll's p:oposed
<br />Ruedi Dnm llnd Reservoi l' on t.he Fryinh,'lmIl Ri\"er and espec-lally to
<br />YDlU' reqlH!st f01" a brief letter report from the Los Angeles Dist.rict
<br />by about August 10, co\'ering flood-control aspects and benefits of
<br />that project.
<br />Upon previolls r:ollsider:tt.iol1 (in 1!)[iO) of the HlIcdi Da,m nnd
<br />Resel'yoir, 0111' agencies concurred in the. opinion that permanently
<br />aSSi,l.,'11ed flood control storag-e at the site could not be eeonomically
<br />just.itied. Howe\'er, snowm~lt floods l1re t.he principal SOuree of flood.
<br />damage in that region tLnd floou eont.rol by the conservation-storage
<br />e\'llclultion bn~ed on forec<lst of snowmelt runotl' will apprecil1hly re-
<br />duce the flood menace. Lirnit.ation. of funds, of personnel, and of time
<br />sutlicient. for a thorough illn~st.igat.ion anrl report ,\"ill not permit a
<br />definite determilIat.ioll of flood control benefits but rough approxima-
<br />tions have been made.
<br />The Frying-pnn RiveT, n. st.ream about 36 miles long, is a tribut.a.ry
<br />of t.he Roaring Fork River, which joins the Colorarlo River at Glen-
<br />wooo. Springs, Colo. The Fryil1gpan Ri\"er draimtge area., which
<br />comprises about 272 square miles, ranges in ele\-'at,ion from a.bout
<br />6.(;(10 feet to a.bout, 13,500 feet abm"e sea. level. The ROHrin(r Fork
<br />]~iver tlrainllge area, which <:omprises ahout 1,460 square nl.iles,~ranges
<br />in elevation from about 5,700 feet to about 13,500 feet. About 830
<br />squlll'e miles of t.his latter drainage area are upstl'eam from Basalt,
<br />which is the point of confluence of t.he :FryingpaJl River and the
<br />Roaring Fork H.iver at. river mile 25.7. The slopes of t.hese two
<br />st.reams, from the Ruedi site to Basalt 'LIld from BasIllt to Gleuwood
<br />Sprin.!!s are nlxHlt 68 feet per mile and 84 feet per mile, respectively.
<br />The Fi"yingpan l\iver below t.he dams}te is generally deeply entrenched
<br />ill a canyon, but t.he. ..f'o:njng If.ol'k RI;"el' meand~rs i.ll l1 l~al'l'OW valley
<br />whose Hoor ranges from one4\a.H mIle to 1 mIle ]n Wlflth between
<br />BasalE1 Carbondale (river inile H), and is genemlly deeplv en-
<br />trenc . - n. narrow valley frum Carbondale to Glenwood Spl~jllgs.
<br />The ,'mdo River Letween (Henwood Springs and the head of
<br />Grund Valley li{~s in a. narrow valley or canj'on ~ections.
<br />57
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<br />523;:il-00-1:S
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