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1921, 1933, and 1938. The other events are listed below, Flood of 30 Mav 1948. On 30 May 1948 a 10calizEid thunderstorm dropped 8 inches of rain and hail in four hours on the lower basin of Sand and Toll Gate Creeks, Flooding resulted downstream of Colfax Avenue, Estimated discharges on Sand Creel< of 7,720 d,s, and 10,500 c.f.s" respectively, at Colfax Avenue and at the mouth caused overbank stages from 4 to 8 feet deep, Tourist cabins near Colfax Avenue and an oil refinery near the mouth were damaged, but farms and livestock feet lots in the flood plain suffered the most Flood of 8 and 9 Mav 1957, A heavy rainstorm occurred over the Sand Creek basin and adjacent areas on 8 and 9 May 1957, Over 4,0 inches of rainfall occurred at the storm center, Major flooding resulted on Sand and Toll Gate Creeks, Runoff from the Sand Creek basin caused severe flooding along the South Platte River. The floodwaters in tile Sand Creek basin receded in less than 12 hours, but high flow conditions along the South Platte River continued for several days as higher than average snowmelt lasted almost to the end of the month, On Sand Creek, near Stapleton International Airport, the flow was estimated to be 25,000 cubic feet per second and upstream from Toll Gate Creek, the Sand Creek discharge was estimated to be 8,000 cubic feet per second, The Toll Gate Creek discharge was estimated to be 10,500 cubic feet per second at East 6th Avenue in Aurora, which is about 2 miles upstream from the mouth of Toll Gate Creek, At 6th Street the fast rising flood crest exceeded the capacity of the culverts and overflowed the roadway, Water flowing up to 1,6 feet deep washed out the road bed, Extensive damages were inflicted on homes, utilities, and bridges, A woman and two children were drowned in a basement apartment by Toll Gate Creek floodwaters, Peak discharge-on the South Platte River at the Henderson gaging station, located about 7 miles downstream from the mouth of Sand Creek, was estimated to be 12,000 cubic feet pm second, Flood of 16 and 17 June 1965, Heavy to torrential rainfall occurred over the Sand and Toll Gate Creek basins on 16 June 1965, Rainfall averaged 2 to 4 inches over the Sand Creek basin, Resulting discharges on Sand Creek were estimated to be 13,400 cubic feet per second at Sable Avenue, located about 0,5 miles upstream from Toll Gate Creek, and 18,900 cubic feet per second downstream from Toll Gate Creek, The peak flow on Toil Gate Creek was estimated to be 17,000 cubic feet per second at East 6th Avenue in Aurora, Heavy runoff from Sand and Toll Gate Creeks caused extensive damage in the Aurora vicinity and contributed additional flood volume to the South Platte 'River north of Denver, Nearly every highway and railroad bridge crossing on Sand and Toll Gate Creeks was either damaged or destroyed, About 750 acres of land adjoining Sanel Creek and 120 acres of land adjoining Toll Gate Creek were inundated, Flooding along the downstream 10 miles of Sand Creek were inundated, Flooding along the downstream 10 miles of Sand Creek spread to widths ranging between 500 and 1,500 feet On the (jownstream 6 miles of Toll Gate Creek, the flood width ranged from 300 to 1,000 feet Transportation and urban damages on Sand and Toll Gate Creeks were estimated at $3,000,000, Additional rainstorms in July 1965 seriously hampered recovery efforts and destroyed temporary bridges, These caused basement flooding in Aurora, 4.1.7 CLEAR CREEK Flood History Records indicate that Clear Creek in the past has not sustained frequent flooding, However, available information does not appear to represent the present basin flood potential. Flooding that has been reported has resulted in either from a combination of storm runoff and heavy Colorado Flood Hydrology Manual 4,9 DRAFr