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<br />199a. Colorado Rood Hazard Mitigation Plan (409;
<br />
<br />Mexico into the Southwest The moisture source is
<br />responsible for many of the summer thunderstorms
<br />over Colorado's mountains and western valleys_
<br />
<br />in late JUly 1997, tropical moisture was streaming
<br />northward across Mexico and the Southwest into Col-
<br />orado_ At the same time, a large high-pressure system
<br />stalled over the central high plains of the United
<br />states_ The system's clockwise rotation pumped very
<br />humid air from the central plains and Gulf of Mexico
<br />into eastem Colorado_ A coid front associated wrth the
<br />high-pressure area over the northern plains, provided
<br />a trigger to set off thunderstorms as moist air masses
<br />converged over Colorado_
<br />
<br />In the 3-4 days preceding July 28, 1997, the City of
<br />Fort Collins and most of eastern Colorado received
<br />soaking andlor drenching rains, adding to soil mois-
<br />ture in some locations_ As the cold front arrived in the
<br />late afternoon of July 27th, strong thunderstorms de-
<br />
<br />I 1997'FIOodlDamage ,II
<br />
<br />"^,~" ..~'.(.,.-f!-,i=-"~'.O.1_':'.l.~'_U-1f.j:i."'Jo.'.,.'-1l:\ ,J'~_','-;II.t~,.J,
<br />
<br />'Public ~istlI~P~tam
<br />$16,955.750. '
<br />
<br />trldividual Assistan~Program... , '
<br />$7925000
<br />'t.,_ __'""
<br />
<br />As of October 1997 . Figure 2-4i
<br />
<br />'.;'~_~.';i.\-J~_'_<:;:CH,:.'_'~"l;;;.,-,j."",U~' "L~~i....,;"';
<br />
<br />veloped just north and west of Fort Colllns_ Later that
<br />night, steady rains developed along the eastern base
<br />()f the foothills in Larimer County and continued until
<br />..bout noon, July 28th_ Several inches of new rain were
<br />
<br />!Seventeeri NiostlDamaging' FioO,cfSlin~b<>IOradO ,~Rgu'e2-5 ' , 'I
<br />
<br />'-"J~I;~~"I'" 1896 ::~~~:a; ~:r~::ion ,,_,}D~~~S-_+.,D:~,:~.~~ _~:'
<br />
<br />-....._~.___.~.__'._,_ '~_~.,'''~.,"__A".' m,__,.__~. .__'___.___ ~_'. ~~...~~~.~ .._"...,"_"~, ._A'"",. "-',-~--."..
<br />Oct 1911 San Juan River near Pagosa Springs 2 100,000
<br />
<br />~
<br />
<br />July
<br />
<br />1912 Cherry Creek at Denver
<br />
<br />June
<br />
<br />1921
<br />
<br />Arkansas River at Pueblo
<br />
<br />__ _._.. __ ._____. ___ ...______..____n_ __________. __________._..___ __-'____ __ __'m _.._".,____.__..~__n___..______._ ---- ,._,~_.__ ---'~_______________
<br />
<br />78
<br />
<br />19,000,000 t
<br />
<br />2
<br />
<br />______,_____"nn__'
<br />1 ,000,000 }
<br />
<br />May 1935 MonumentCreekatColoradofSprings 18 1,760,000 I
<br />_________._ __ _m_____~____..__ __________________. _~______'.__n__________..______._______m ----.--- --,...--...- .----..-- ~ j
<br />___~ay___1~35__ Kiowa c':~~n'='~_~~____~______~_____=--_________~~_:~~-_l
<br />May 1955 Purgatory River at Trinidad 2 4,000,000 !
<br />_.______________. ___..__,__.....__ _,...__,___________..______.___.__________..____~m_______.__-- ...-------... .--, --,,-,--------- .'--'-. ...,., -- ,-_.---. -.-- 1
<br />June 1965 South Platte River at Denver 8 500,000,000 f
<br />--Ju;~-- -1965- Arkan;~~Ri~;~-B~;n---n--- ----- --16- --u-46,ioo~Ooo-- !
<br />
<br />- ----------- -------I---------_._------------~---- --------------~ --------- ~---------------- \
<br />May 1969 South Platte River Basin 0 5,000,000 i
<br />,
<br />_____ ___ __ ___ . _____ ___._________________ -------------------- ---------- _____u____ -- - nu______________ t
<br />Sept 1970 Southwest Colorado 0 4,000,000 -
<br />
<br />May
<br />
<br />1973 , South Platte River at Denver
<br />--- ... -- -- --- - --- --
<br />1976 Big Thompson River and Canyon
<br />
<br />July
<br />
<br />10
<br />
<br />121,500,000
<br />
<br />144
<br />
<br />35,500,000
<br />
<br />July
<br />
<br />1982
<br />
<br />Fall River at Estes Park
<br />
<br />._.______ ______._..__ _n____~..._ __ _ _.___._ _..._______ _.___________________ --'___ ______ u,._____..__.____ u_ ___ __.,_______...___. -, un__ --,-.-----.--.--'"
<br />
<br />3
<br />
<br />30,680,000
<br />
<br />June
<br />
<br />1983
<br />
<br />North Central Counties
<br />
<br />10
<br />
<br />17,500,000 ,
<br />
<br />2
<br />
<br />31,000,000 ,
<br />I
<br />. .__..,____ .,. ___ _____ _,___, I
<br />1 ,794830 !
<br />,
<br />-- ---------------- I
<br />200,000,000 ;
<br />I
<br />;
<br />
<br />May-June
<br />
<br />1993
<br />
<br />Flooding Western Slope
<br />
<br />Western and Northwestern Counties
<br />
<br />o
<br />
<br />May-June
<br />
<br />1984
<br />
<br />6
<br />
<br />July
<br />
<br />1997
<br />
<br />Fort Collins, Larimer, Weld, Legan, Phillips,
<br />Morgan, Elbert, Lincoln, Crowley, Kiowa, otero,
<br />Prowers, Baca, and Clear Creek Counties
<br />
<br />FiI.:FHMP.chapter.2.pub
<br />
<br />Chapter 2 . 5
<br />
<br />1/29/9810:14 AM
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