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<br />South Boulder Creek basins the rainfall continued at a moderate rate for nearly 4 days. <br />Total precipitation for the storm amounted to 7,60 inches at Boulder and 9,34 inches at the <br />Boulder Hydroelectric Plant located about 3 miles up the canyon from Boulder. <br />Precipitation amounts totaled 8,11 inches at Eldorado Springs and 10.05 inches at Gross <br />Reservoir on South Boulder Creek. Peak flooding occurred on Ihe 7th of May on both <br />Boulder and South Boulder Creeks, The gaging station at Orodell recorded a peak <br />discharge of only 1,220 cubic feet per second. In Boulder, however, local inflow increased <br />the Boulder Creek peak to an estimated 3,000 cubic feet per second. The peak discharge <br />on South Boulder at Eldorado Springs was 1,690 cubic feet per second. Flooding below <br />the confluence of these two streams exlended over large portions of the flood plain. <br /> <br />4.10 CLEAR CREEK <br /> <br />Flood Historv Records indicate that Clear Creek in the past has not sustained frequent <br />flooding. However, available information does not appear to represent the present basin <br />flood potential. Flooding that has been reported has resu~ed in either from a combination <br />of storm runoff and heavy snowmelt or from cloudburst type storms over relatively small <br />areas of 25 square miles or less. Since 1864, twelve floods have been reported on Clear <br />Creek and its tributaries. Details of these floods are meager and no lives are reported as <br />having been lost. The following descriptions of the floods of August 1888, June 1956, and <br />July 1965 are typical of the information currently available. <br /> <br />Flood of August 1888. This flood resulted from cloudbursts on the eastern slope of the <br />front range of the Rocky Mountains. A discharge of 8,700 cubic feet per second was <br />recorded-at the moulh of Clear Creek canyon. This is the largest measured discharge In <br />the history of this gaging station which is located 1.5 miles upstream from Golden. <br /> <br />Flood of June 1956. Unusually heavy snowmelt runoff resu~ed in the failure of the <br />Georgetown Dam located about one mile downstream from Georgetown. The peak <br />discharge passing the gage above Golden was 5,250 cubic feet per second. By the time <br />the crest reached the gaging station near the mouth of Clear Creek it was reduced to <br />2,880 cubic feet per second. <br /> <br />Rood of 23-26 July 1965. On 23-24 July during severe storms over the headwaters of <br />Clear Creek and Tucker Gulch, 4.5 inches of rain was reported to have fallen in Tucker <br />Gulch in an hour and caused flash flooding in Golden and Georgetown, Colorado. <br />Flooding exlended only a short distance downstream. In Golden, flood waters from Tucker <br />Gulch spread over 17 blocks and caused an estimated $112,000 damage to 69 <br />residences, 3 commercial enterprises, 3 railroad bridges, 4 street bridges, and utility lines. <br />At Georgetown, debris blocked the channel and diverted the waters down a street, thereby <br />causing exlensive washing of the surface and the flooding of several basements. <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />4,15 <br /> <br />epn::r <br />