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Left-Hand Creek. Overbank flows occurred along most of the length of Left-Hand Creek. Bridges, roads, <:rops, and irrigation structures were damaged. , 4.1.10 DRY CREEK Flood Historvc' Little information is available relative to historic flooding on Dry Creek probably because of its rural nature which has resuited in little flood damage during flood evenfsc Information is available, however, on adjacent streams which indicate that floodwater may have been experienced on Dry Creek. The following are accounts of some of the heavy rainfall events which havB occurred in the Dry CrBek areac ~ Flood of Mav-June 1894. Heavy rains fell.on 19 May - 2 June over the mountains and plains extending from the Colorado-Wyoming border southward into the Republican and Arkansas River basins. 'Rainfall amounts over the high plains gradually decreased from west to east varying from 5 inches at Boulder to approximately 2c5 inches at the mouth of Boulder Creek. Flood of Junl~ 1921. Heavy general rainfall occurred from 2 June - 6 June over the South Platte River basin with the greatest amounts along the foothills of the Rocky Mountains. Rainfall covered an area of approximately 520 square miles. The maximum recorded rainfall was 5.29 inches and the greatest recorded rainfall intensity was 4.3 inches in 6 hours at Longmont. Rainfall totaled 3.36 inches at Boulder. Flood of AUllust-Seotember 1938. Heavy rainfall occurred from 31 August to 4 September over all of eastem Coloradoc Boulder reported 3.36 inches of precipitation from 31 August to 4 September with 2.32 inches falling during 2 SeptembeL Flood of AuolJst 1951. On the afternoon and evening of 3 August. very heavy rainfall occurred along E;O miles of the Front Range and foothills from Boulder to Fort Collins. Unofficial reports indicated 6.3 inches of precipitation occurred near Lyons and more than 6 inches occurred southwest of Niwot. A flood peak determination of 5,700 cfs on Dry Creek was obtained about 1.5 miles south of Niwot. The crest of the flood occurred about 9:50 p.m. on 3 August. The flood swept across U.S. Highway 287, 2 miles south of Longmont, at about 10:45 p.m. The flood on Dry Creek, which was 1/4 miles wide in places, swept away crops, buildings, and equipment and required the evacuation of about 50 people. Railmad and highway embankments and bridges were washed out. Flood of Mav 1969. Heavy rainfall with a relatively long duration occurred from 4 May until 8 May. The storm covered an area along and near the eastem slopes of the Rocky Mountains and extended into portions of the high plains. The heaviest amounts were centered 25 mile:; southwest of Denver and extended in a band along the foothills of the Rocky Mountains northward of Estes Parle Rainfall amounts of 7.60 inches were reported at Boulder. . ~ Colorado Flood Hydrology Manual 4.14 fPIff