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4.1.7 CLEAR CREEK . Flood Historv Records indicate that Clear Creek in the past has not sustained frequent flooding. However, available infonnation does not appear to represent the present basin flood potential. Flooding that has been reported has resu~ed in enher from a combination of stonn runoff and heavy snowme~ or from cloudburst type storms over relatively small areas of 25 square miles or less. Since 1864, twelve floods have been reported on Clear Creek and ns tributaries. Details of these floods are meager and no lives are reported as having been lost. The following descriptions of the floods of August 1888, June 1956, and July 1965 are typical of the information currently available. . Flood of Auaust 1888c This flood resu~ed from cloudbursts on the eastem slope of the front range of the Rocky Mountains. A dischargB of 8,700 cubic feet per second was recorded-at the mouth of Clear Creek canyon. This is thB largest measured discharge in the history of this gaging station which is located 1.5 miles upstream from Golden. Flood of June 1956. Unusually heavy snowme~ runoff resu~ed in the failure of the Georgetown Dam located about one mile downstream from Georgetown. The peak discharge passing the gage above Golden was 5,250 cubic feet per second. By the time the crest reached the gaging station near the mouth of Clear Creek n was reduced to 2,880 cubic feet per second. Flood of 23-26 Julv 1965. On 23-24 July during severe storms over the headwaters of Clear Creek and Tucker Gulch, 4.5 inches of rain was reported to have fallen in Tucker Gulch in an hour and caused flash flooding in Golden and Georgetown, Colorado. Flooding extended only a short distance downstream. In Golden, flood waters from Tucker Gulch spread over 17 blocks and caused an estimated $112,000 damage to 69 residences, 3 commercial enterprises, 3 railroad bridges, 4 street bridges, and utility lines. At Georgetown, debris blocked the channel and diverted the waters down a street, thereby causing extensive washing of the surface and the flooding of several basements. 4.1.8 BOULDER CREEK Flood Historv. Floods in the Boulder Creek basin are produced by intense rainfall during enher isolated or general stonn systems. In addnion, there is nonnally an increase in flows during the mountain snowmB~ period in May and June which is frequently augmented by rainfall runoff. Large floods in the basin were reported in 1864,1876,1894, 1914,1923.1938, and 1969. ~ Flood of 29 Mav - 2 June 1894. Heavy rains fell over the mountains extending from the Colorado-Wyoming border southward into the Republican and Arkansas River basins. Rainfall over the BouldBr and South Boulder Creek basins was particularly heavy. Rainfall records for a 96-hour period ending at 3:00 a.m. on 2 June 1894 indicate that the mountain drainage area received from 4.5 to 6.0 inches of precipnation. -Rainfall amounts .. Colorado Flood Hydrology Manual 4.11 aw=r