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<br />2.2,2 Historic Flood Damages <br /> <br />Compilations of exact data on the history <br />Colorado since settlement began is lacking. <br />known floods are reported t.o have occurred <br />Arkansas River and Republ ican River basins. <br />thirty large magnitude floods (in terms of <br />occur somewhere in Colorado every year. <br /> <br />of floods in <br />The earliest <br />in 1826 in the <br />Between 20 and <br />peak discharge) <br /> <br />The fourteen most damaqing floods i.n Colorado recorded <br />history are listed below: <br /> <br />Date <br /> <br />July <br />October <br />July <br />June <br />May <br />May <br />May <br />June <br />June <br />May <br />Sept. <br />May <br />July <br />July <br /> <br />The <br />the Big <br />killed. <br /> <br />1896 <br />1911 <br />1912 <br />1921 <br />1935 <br />1935 <br />1955 <br />1965 <br />1965 <br />1969 <br />1970 <br />1973 <br />1976 <br />1982 <br /> <br />Major Stream and Location <br /> <br />Loss of <br />Life <br /> <br />Damages <br /> <br />$ 100,000 <br />1,000,000 <br />19,000,000 <br />1,760,000 <br /> <br />4,000,000 <br />500,000,000 <br />46,700,000 <br />~;,OOO,OOO <br />4,000,000 <br />121,500,000 <br />35,500,000 <br />30,680,000 <br />$769,240,000 <br /> <br />most lives lost due t.o a ~;ingle flood €!vent occurred in <br />Thompson c;anyon on Jl1ly 31, 1976 when 139 people were <br />Five people are still missing or unaccounted for. <br /> <br />Bear Creek at Morrison 27 <br />San Juan River near pagosa Spr, 2 <br />Cherry Creek at Denv€!r 2 <br />Arkansas River at Pueblo 78 <br />Monument Creek at Colo. Springs 18 <br />Ki~a Creek ,near Kio~la 9 <br />purgatorie ~'iver at Trinidad 2 <br />South Plat~e' River at Denve:lk)':, 8 <br />Arkansas Rl ver ..ac,'CoJ;O';,",S1H'i:1'I~'S- 16 <br />Bear Creek in BOl1lder 0 <br />Southwest: Colorado lC'.oI" 0 <br />South Platte River at~~~ 10 <br />Big Thompson River in Canyon 139 <br />Fall River at Estes Park 3 <br />314 <br /> <br />The most damaging flood in Colorado occurred in June 1965 <br />on the South Platte River when almost $500 million in damages <br />was sustained in the Denver-metro area. <br /> <br />Cumulative flood losses for the 14 most damaging floods in <br />Colorado since about the tur n of the century were 314 people <br />killed and $769,240,000 in property damages, as shown in figures <br />2.8 and 2.9, Using the consumer price index to adjust past flood <br />damages at the time of each event to present (1982) worth, total <br />flood damages are estimated at over $1,600,000,000. <br /> <br />On the average a major flood event has occurred <br />years killing 22 persons and leclving $114,300,000 in <br />(present worth). <br /> <br />every 6 <br />damages <br /> <br />The average annual flood loss in Colorado is at least 3.6 <br />persons per year and $14,000,000 in property damages based on <br />the trend from 1896 to 1976, <br /> <br />-31-' <br />