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<br />over the high plains gradually decreased from west to east and varied from 5 inches at <br />Boulder to approximately 2.5 inches at the mouth, The mountain rainfall combined with <br />the snowmelt runoff to produce the greatest flood known at Boulder. which came roaring <br />down the valley during the night of 30 May 1894, Buildings. bridges and even long <br />sections of roads and railroads were washed away, Damage was exceptionally heavy <br />along Fourmile Creek and in Boulder, Computations made 18 years later by Metcatl and <br />Eddy produced estimates of the peak discharge in Boulder that ranged from 9.000 cubic <br />feet per second to 13.600 cubic feet per second, <br /> <br />Flood of 1-2 June 1914, This flood was caused by rainfall on 1 June of more than 1 <br />inch on North Boulder Creek near Silver Lake at an elevation of 10.200 feet. The flood, <br />described as the worst since 1894, washed out numerous bridges between Colburn Mill <br />and Boulder Falls. Several hundred feet of main line for Boulder's water system were <br />destroyed, The peak discharge in Boulder was estimated at 5.000 cubic feet per second, <br /> <br />Flood of 2-7 June 1921, Little is known of this flood except that it produced the highest <br />peak discharge ever recorded at the Oradell gage. .A discharge of 2.500 c.f ,s, was <br />recorded on 6 June, Rainfall totaled 3,36 inches at Boulder through a period of 2-7 June. <br /> <br />Flood of 3-10 June 1923. This storm centered over the high plains east of the <br />mountains. Rainfall at Boulder totaled 3,84 inches through a period of 3-10 June with 2,39 <br />inches of the total precipitation falling on 9 June. Combined flows from Boulder. South <br />Boulder. and Bear Canyon Creeks produced flooding downstream of Valmont, <br /> <br />Flood of 4 SeDtember 1938. A large storm produced general rains over all of Eastern <br />Colorado, The largest amounts of precipitation occurred in the mountains where over 6 <br />inches was reported west of Eldorado Springs, Boulder reported 3,62 inches of <br />precipitation from 31 August to 4 September with 2.32 inches falling on 2 September, <br />Eldorado Springs, located in the South Boulder Creek basin, had 4,42 inches of rainfall, <br />Approximately 80 percent of the total precipitation falling in the South Boulder Creek basin <br />fell in the late aftemoon and evening of 2 September, The resulting flood on South <br />Boulder Creek had an estimated peak discharge of 7.390 c.f,s. at the Eldorado Springs <br />gaging station, The peak gradually subsided as the flood moved downstream, maximum <br />discharge of 4,410 c,f,s, occurred near the mouth of Boulder Creek at noon on 3 <br />September. Several buildings in Eldorado Springs were destroyed as a result of erosion <br />around their foundations. Numerous bridges were destroyed and the South Boulder Creek <br />valley from Eldorado Springs to Boulder Creek and down Boulder Creek to the St, Vrain <br />Creek was described by local newspapers as being in shambles, This flood is the highest <br />recorded flood on the South Boulder Creek, <br /> <br />Flood of 6-8 Mav 1969, This flood was also the result of long duration rainfall, <br />Precipitation was heaviest in the mountains. part of which fell as snow, In the Boulder and <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 atthe <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 the 7th of May on both <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />4,12 <br /> <br />fRIJFT <br />