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<br />
<br />1998. Colorado Flood Nllzllrd Mitiglltion Pllln (409j
<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 eastern Colorado. A cold front associated with 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 />1997 Flood Damage
<br />
<br />I.
<br />
<br />Public Assistance Program
<br />$16,955,750
<br />
<br />Individual AssistanCe Program
<br />$7,925,000
<br />
<br />1
<br />I
<br />
<br />As of October 1997 - Figure z.o
<br />
<br />In the ~ days preceding July 28, 1997, the Crty of
<br />Fort Collins 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 afternoon of July 27th, strong thunderstorms de-
<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 />1
<br />
<br />Seventeen Most Damaging Floods in Colorado - Rgure 2.5
<br />
<br />July
<br />
<br />_J
<br />
<br />Major Stream or Location
<br />18~ _ -' ~ear Creek at Morrison _ __
<br />1911 San Juan River near Pagosa Springs
<br />
<br />Date
<br />
<br />Oct
<br />
<br />July
<br />
<br />1912 Cherry Creek at Denver
<br />1921 Arkansas River at Pueblo
<br />
<br />June
<br />
<br />May
<br />May
<br />May
<br />
<br />1935
<br />
<br />1935
<br />
<br />June
<br />
<br />1955
<br />1965
<br />1965
<br />1969
<br />1970
<br />1973
<br />1976
<br />
<br />June
<br />
<br />May
<br />Sept
<br />May
<br />July
<br />July
<br />
<br />1982
<br />1983
<br />
<br />June
<br />
<br />May.June
<br />May.June
<br />
<br />1984
<br />1993
<br />1997
<br />
<br />July
<br />
<br />- - _. - -..
<br />
<br />F/I&:FHMP.chap(er-2.pub
<br />
<br />Monument Creek at Colorado Springs
<br />Kiowa Creek near Kiowa
<br />
<br />Purgatory River at Trinidad
<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 />
<br />Fall River at Estes Park
<br />
<br />North Central Counties
<br />
<br />Western and Northwestem Counties
<br />
<br />Flooding Western Slope
<br />
<br />Fort Collins, Larimer, Weld, Logan, Phillips,
<br />Morgan, Elbert, Lincoln, Crowley, Kiowa, Otero,
<br />Prewers, Baca, and Clear Creek Counties
<br />
<br />..~
<br />
<br />Chapter 2 - 5
<br />
<br />Deaths
<br />
<br />Damages
<br />
<br />L 27
<br />2
<br />2
<br />
<br />$ -------
<br />
<br />100,000 ~
<br />I
<br />(
<br />
<br />1,000,000 I
<br />
<br />78
<br />18
<br />9
<br />
<br />19,000,000
<br />
<br />1,760,000
<br />
<br />2
<br />8
<br />
<br />4,000,000 i
<br />
<br />500,000,000 I
<br />.
<br />
<br />16
<br />
<br />46,700,000
<br />5,000,000
<br />4,000,000
<br />121,500,000 i
<br />35,500,000 !
<br />
<br />.
<br />
<br />o
<br />o
<br />
<br />10
<br />
<br />144
<br />
<br />3
<br />
<br />30,680,000
<br />17,500,000
<br />31,000,000
<br />1,794830
<br />
<br />10
<br />
<br />2
<br />o
<br />6
<br />
<br />\
<br />200,000,000 \
<br />
<br />l
<br />
<br />~ -
<br />
<br />112"" fO:14A.l1
<br />
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