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2-6Junel921 Tnls storm produGed gener~1 r~ins over tho South Platte basin with the'lreatest amounts alonqthe toothllls. It covered an area of approximately 520 square miles and lasted 5 days. Themax- imumrecorded rainfall was 5.29 inChes and thegreafest recorde d rainfall intensity was 4.3 inches in six hours at Longmont. This Ilood waS produced by a combinatIon of rainfall and srtQwmelt. Although this storm caused overbank Ilooding neither dlsGharges nor damag €IS were n'Gorded. centers was in the Left-Hand Creek near the town of Niwot. At this storm center, total precIpItation was unofficially reported to have been over 6 Inches. The runoff from this storm caused flooding on St. Vraln Creek and on it's tributaries, Dry Creek and Left-Hand Creek. Overbank flows occurred along most of the length of Left~ Hand Creek. Bridges, roads, crops, and IrrIgation structures were damaged. 3 September 1938 During this storm, showersweregenerlll over the Left-Hand Creek basin aCCOOlpaniedby isolatedcloudburstsalongthetoothllls and fhe lower elevations. A m~xlmum peak discharge of 812 cubic feet per second "as recorded at the U.S. Highway 287 gaging station near Longmont. This gaging statIon was not in operation during the 1949 and 1951 floods. 4 June 1949 On 4 June 1949, the Left-H~nd Creek had overban~ Iloodlng as a res~lt of hellvV <lnd rrolonge<1 r<linhll durin'l I~t€! May and early June and the runoff trom"n unusual IV heavy snow blanket. Thepro- lonQod high flow on Left-Hand Creek cau~ed minor damages to irrigation headworks, bridges, and I~rmlands. The gagIng station near Boulder record€!d a po"k d ischargo of 1,140 Cubic f-oot per second during the tloodperiod. 3 August 1951 DurIng the afternoon and night 01 3 August, a heavy raIn- storm occurred Over the frontal range and foothills ""st of the Con~ tlnentalDividefromthevicinltyofllouldertoooarfortColllns, Colorado, a dIstance of approximately 50miles. One 01 the storm " "