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<br />noar Louioville, Colorade. The flood of Septembor 2, 1938 was oausod by
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<br />cloudbursts in the mountains and foothills, which resulted in a floed
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<br />slightly highor than in 1935.
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<br />T,lO flood cUschargeo on Coal Gro0k [\t Clrie,
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<br />Coloradd 110l'0 ostimn.tod by slope-c.roa. lI'.eastl:t'fJments to.be 13,200, 7,800 =d
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<br />3.500 so cond_foot in 1876, 1921 and 1933, l\cspoctively, The 1876 end 1921
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<br />floods woro tha maximum floods at Erio, Colorado.
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<br />5S. St. Vrain Croak.
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<br />Sevoro.l floods have been ex::?oriol1cod on t>..~
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<br />st. Vrain Creole, but only threo caused any approoiablo damage, The genoral
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<br />stonn or" l:'ay 31, 1894 centorsd ovo" tho hoad:wuters of St. Vrain Creek. It
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<br />oaused floodir~g on all t:1C streams tributr.ry to St. .'~/ro.in Creek. The 30uth
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<br />Fork had .the maximum flood of the tributcrios. The peak discharge e.t Lyons.
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<br />Colorado was 9,800 second-fn'ct, The flood of July 30-31,1919' on St. Vrc.in
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<br />Crock was causod by scvere oloudbursts above Lyons, Colorado, On Jelly 30,
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<br />a pede disc:mrge of 9.408 second-foet eocurred "t Lyons and on "lli'1o following
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<br />d~'.y anothe r flood of alma r:t tho same height VIC'.S C. "lJerienood.. Followi1:g t>.G
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<br />general storm of September 3, 1938, a flood occurrod en St. Vr~in Crook
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<br />hnving a poalc dischl:'.l'ge uf 1,G50 soeond-feet c.t Lyons n'ld 8,3GO seeond-fe~t
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<br />at the mouth. !clinor floods llrero ",:perienced in 1864, 190.~, 1921,cm(l 1923.
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<br />50.
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<br />Bi~ T~omDson Rivor.
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<br />:~c~ordinG to p,-,st reoords, tho Big Thompson
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<br />Rivur is subject to damaging flOOds, mt:-ny of \Thioh arc flash_floods thc.t
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<br />originate in -t he foothills and Etre dissipated by valley st orage ECld irri-
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<br />gation diversions before they travel very fer downstre'lll1. The wide-spread
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<br />storm of May-June 186.~ cnuscd the maximum flood of record in the Big
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<br />Thompson valloy. It inundated the valloy end dest"coyed several settlers'
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<br />cabins. Heavy rainfall ovor the foothills and the plains regions on June 2_8,
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<br />1921 caused severe floods on the Big 1'hompson River and" discharge ::.t Uw
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<br />mouth of the river of about 7,GOO seoond-feet. :. flood on Soptembor 2-3,1938,
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<br />resulting f'ron cloudbursts along the ec,stern slope, wc.s reportod to :,ave bocn
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<br />-ewo ftio-c t.lawe:t- 1lh:m the' tllood of 1921 near La~:n1Md, J'inor floods were roportod
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<br />in 1900, 1906, 1919, and 1923.
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<br />II-29
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