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<br />. <br /> <br />valley from Eldorado Springs to Boulder Creek and down Boulder <br /> <br /> <br />Creek to the St. Vrain Creek was described by local newspapers as <br /> <br /> <br />being in shambles, This flood is the highest recorded flood on <br /> <br /> <br />South Boulder Creek. <br /> <br />. Flood of 6-8 May 1969. This flood was also the result of <br /> <br /> <br />long duration rainfall. Precipitation was heaviest in the mountains, <br /> <br />part of which fell as snow. In the Boulder and South Boulder Creek <br /> <br /> <br />basins the rainfall continued at a moderate rate for nearly 4 <br /> <br /> <br />days. Total precipitation for the storm amounted to 7.60 inches <br /> <br /> <br />at Boulder and 9.34 inches at the Boulder Hydroelectric Plant <br /> <br /> <br />located about 3 miles up the canyon from Boulder. Precipitation <br /> <br />amounts totaled 8.11 inches at Eldorado Springs and 10.05 inches <br /> <br /> <br />at Gross Reservoir on South Boulder Creek. Peak flooding occurred <br /> <br /> <br />on the 7th of May on both Boulder and South Boulder Creeks. The <br /> <br /> <br />gaging station at Orodell recorded a peak discharge of only 1,220 <br /> <br /> <br />cubic feet per second. In Boulder, however, local inflow increased <br /> <br /> <br />the Boulder Creek peak to an estimated 3,000 cubic feet per second. <br /> <br /> <br />The peak discharge on South Boulder at Eldorado Springs was 1,690 <br /> <br /> <br />cubic feet per second. Flooding below the confluence of these two <br /> <br /> <br />streams extended over large portions of the flood plain, <br /> <br />Discharge-Probability Profiles. The fragmentary gaging <br /> <br /> <br />record for Boulder Creek at Boulder was considered too short to <br /> <br /> <br />be a reliable basis for estimating the discharge-probability at <br /> <br /> <br />Boulder. The 67-year record for Boulder Creek at Orodell, although <br /> <br /> <br />much longer, does not include the flows on Fourmile Creek, which, <br /> <br /> <br />according to historical information, has been the major source of <br /> <br /> <br />flooding in Boulder. For this reason, the discharge-probability <br /> <br /> <br />profiles for Boulder Creek were developed using the EPA watershed <br /> <br />. <br /> <br />45 <br /> <br />_1_ <br />