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<br />mountains. R"infall ar80uldcr totalod 3.84 inches through a period <br />01 3-10 June '~ith 2.39 I nches of tho total prec ip Itation fa II ing on <br />9 Juno. Combined flows from Boulder. South Boulder, and aear Canyon <br />Creeks prOduced flooding downstream of Yalmont. <br /> <br />and 10.05 inches at Gross Reservoir on South Boulder Creok. Peak <br />flooding occurrad on the 7th of i'l.ay at Bouldorand EldoradoSprings. <br />Prollminaryestimatos based on tho gaging records, indicate a peak <br />discharge of 1,150 c.f.s. occurred on Boulder Creek. Flooding extended <br />over large portions of the flood plain starting at tho junction of the <br />two streams near Yalmont Road and exrending downstream through the <br />remalndor of the Boulder Creek study reach. Evidence of two bridge <br />f",ilures Is illustrated Inthisreport. <br />The gaging records show that floods the sIze of the <br />May 1969 flood occur on an average of about cnce every five years on <br />Boulder Creek and about cnce every seven years on South Boulder Creek. <br /> <br />31 August 4 September 1938 <br />This storm produced general ralnsoverallofeastorn <br />Colorado. Th~ largest amounts of precipitation occurred In the <br />mountains wnere Over 6 Inches was reported west of Eldorado Springs. <br />Boulder reported 3.62 inches of precipitation trom 31 August to <br />4 September with 2.32 inches tailing during 2 September. Eldorado <br />Springs had 4.42 Inches of rainfall. Approximately 80 percent of the <br />totalprecipltationlalling in the South Eloulder Creek bilsin fell in <br />thelateafternoonandevenlngof2Septernber. The resulting flood, <br />with a peak discharge of 7,390 c.f.s. arrivod at Eldorado Springs at <br />10,00 p.m. on 2 Septemb"r. The peak gradually subsided i1Z the flood <br />moved downstream. A maximum discharge of 4,410 c,f.o. occurred near <br />tho mouth of EloulderCroek at nOOn On 3 September. Several buildings <br />in Eldorado Springs were destroyed as iI result Of tho flood eroding <br />away their foundations. Numerous bridges were destroyed and the <br />va 116Y from EIc1oril<lo Sprl ngs to Bou Ider Creek ilod do~n 8ouldOlr Cre"k <br />totheSt.','rainCrllllkwilS inshilmbles. This flood is thuhigh"st <br />recorded flood on $outhooulderCrllek. <br /> <br />4-8Mily1959 <br /> <br />,h is Io'a5 a Iso a f 1000 of long duration gen<>rill ~Torm. <br />Pr<>clpitationwasheavlost inthenountains;pilrtof itoeingsnow. <br />In tll<l Boulder and South aovldllrCreek basins the raintall continued <br />at d moderate rat" for nQ<lrly four days. Total precipitatiorl tor the <br />ztormilmountedto7.60 inchosat Bovldor and 9.34 inChes at the <br />l30ulder Hydroolectric Plant located il~t 3 miles uo the canycn from <br />8oul~er. Prllcloitation aMovnts tO~i1ICd 8. I I Inches at Eldorildo Springs <br /> <br />" <br /> <br />20 <br />