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<br />199B. Colorado Flood Hazard Mitigation Plan (4091
<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 Juiy 1997, tropical moisture was streaming
<br />northward across Mexico and the Southwest into Col-
<br />orado. M. 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 Gutt of Mexico
<br />into eastern Colorado. A cold front associated wrth the
<br />high-pressure area over the northem 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 Coilins and most of eastern Colorado received
<br />soaking and/or drenching rains, adding to soil mois-
<br />ture in some locations. As the cold front arrived in the
<br />late aflemoon of July 27th, strong thunderstorms de-
<br />
<br />I:: i:i:'~S_Uf:I~i:pa"_::':il
<br />
<br />J;~0"'~.'i1;' _. _ ,'n"," 'UH' "'.C,~, ~
<br />
<br />
<br />As of October 1997 - F;gll1l! 2-6
<br />
<br />L1'-1-.I..''''
<br />
<br />veloped just north and west of Fort Collins. Later that
<br />night, steady rains developed along the eastern base
<br />of the foothills in Larimer County and continued until
<br />about noon, July 28th. Several inches of new rain were
<br />
<br />::mi!i:!:m:m:s.~nteenMost:Damag1ng.FIOOdS'h1e6tQ~o:~:fi~
<br />
<br />
<br />Date
<br />
<br />.....~U.,:...._~ L~1.8~ ,.
<br />
<br />Oct. 1911
<br />
<br />July
<br />
<br />June
<br />
<br />May
<br />
<br />May
<br />
<br />May
<br />
<br />June
<br />
<br />June
<br />
<br />May
<br />Sept.
<br />May
<br />July
<br />July
<br />
<br />June
<br />
<br />May-June
<br />May-June
<br />July
<br />
<br />1912
<br />
<br />1921
<br />
<br />1935
<br />
<br />1935
<br />
<br />1955
<br />
<br />1965
<br />1965
<br />
<br />1969
<br />1970
<br />1973
<br />1976
<br />1982
<br />1983
<br />1984
<br />1993
<br />1997
<br />
<br />RIe:FHMP-Chapter-2.pub
<br />
<br />Major stream or Location
<br />
<br />IB~r~~e~k ~~~~I~~"."'~-' .'..
<br />
<br />San Juan River near pagosa Springs
<br />
<br />Cherry Creek at Denver
<br />Arkansas River at Pueblo
<br />
<br />~[2~. wI
<br />2
<br />
<br />$ -------
<br />
<br />100,000 '
<br />1,000,000
<br />19,000,000
<br />
<br />2
<br />78
<br />
<br />Kiowa Creek near Kiowa
<br />
<br />Monument Creek at Colorado Springs
<br />
<br />18
<br />
<br />1,760,000
<br />
<br />Purgatory River at Trinidad
<br />
<br />South Platte River at Denver
<br />
<br />Arkansas River Basin
<br />
<br />South Platte River Basin
<br />
<br />Southwest Colorado
<br />
<br />South Platte River at Denver
<br />
<br />Big Thompson River and Canyon
<br />Fail River at Estes Park
<br />
<br />North Central Counties
<br />
<br />Westem and Northwestern Counties
<br />
<br />9
<br />2
<br />
<br />4,000,000
<br />500,000,000
<br />
<br />8
<br />
<br />16
<br />
<br />46,700,000
<br />
<br />o
<br />
<br />5,000,000
<br />
<br />o
<br />
<br />4,000,000
<br />
<br />10
<br />144
<br />3
<br />10
<br />2
<br />o
<br />6
<br />
<br />121,500,000
<br />35,500,000
<br />
<br />30,680,000
<br />17,500,000
<br />31,000,000
<br />1,794830
<br />
<br />Flooding Westem Siope
<br />
<br />Fort Coilins, Larimer, Weld, Logan, Phillips,
<br />Morgan, Elbert, Lincoln, Crowley, Kiowa, otero,
<br />Prowers, Baca, and Clear Creek Counties
<br />
<br />200,000,000
<br />
<br />Chapter 2 . 5
<br />
<br />1129/9816.14 AM
<br />
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