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<br />".. .heavy to torrential rainfall occurred over the Sand and <br />Toll Gate Creek Basins on June 16, 1965. Rainfall averaged <br />between 2 to 4 inches over the Sand Creek Basin. Toll Gate <br />Creek flow was estimated to be 17,000 cfs at 6th Avenue, and <br />Sand Creek downstream from Toll Gate Creek was estimated to be <br />18,900 ds. Nearly every bridge crossing the creeks was <br />damaged or destroyed. The flooding caused extensive damages <br />in the Aurora vicinity. The downstream 6 miles of Toll Gate <br />Creek overflowed from 300 to 1,000 feet wide; the downstream <br />10 miles of Sand Creek flooded 500 to 1,500 feet wide. <br />Transportation and urban damages on Sand and Toll Gate Creek <br />was estimated at $3,060,000.00. Additional rainstorm in J".ly <br />of 1965 seriously hampered recovery efforts and destroyed <br />temporary bridges" (References 12 and 13). <br /> <br />Photographs of historic flooding are shown in Figures 2 <br />through 9. There is little documentation of, historic floods <br />and damage estimates on the other tributary streams within <br />Aurora. The tributary streams have caused overland inundation <br />of homes and streets to depths of as much as 4 to 4.5 feet, <br />but there are no recorded discharges or damage estimates <br />(References 12 and 14). <br /> <br />2.4 Flood Protection Measures <br /> <br />A major flood control structure in Aurora is Quincy Dam on <br />Toll Gate Creek, which was completed in 1974. The dam and <br />reservoir serve as a water storage facility and provide <br />approximately 4,500 acre feet of storage for flood control. <br />The dam controls the upper 4.5 square miles of the drainage <br />basin (Reference 15). <br /> <br />There are two significant storm water detention ponds along <br />Westerly Creek. The pond located between Alameda and <br />Exposition, constructed in 1972, will contain approximately 67 <br />percent of the 100-year flood. The other facility, Kelley <br />Dam, constructed in 1953, would contain the ll-year flood, <br />although during a large magnitude flood in excess of a 40-year <br />flood, the pond might fail and increase flow downstream <br />(Reference 14). Other flood protection measures consist of <br />channel improvements on the Cherry Creek Spillway Drain and <br />West Toll Gate Creek. <br /> <br />A major drainageway planning report has been completed for <br />Sand Creek (Reference 16). This report designates various <br />structural measures and nonstructural actions that would be <br />appropriate for alleviating potential flood damage along this <br />stream. <br /> <br />6 <br />