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<br />Flood of 30 Mav 1948. On 30 May 1948 a localized thunderstorm dropped 8 inches <br />of rain and hail in four hc'urs on the lower basin of Sand and Toll Gate Creeks. Flooding <br />resuKed downstream of Co~ax AVBnue. Estimated dischargBs on Sand Creek of 7.720 <br />c.f.s. and 10.500 c.f.s., rE,spectively. at Co~ax Avenue and at the mouth caused overbank <br />stages from 4 to 8 feet deep. Tourist cabins near Co~ax Avenue and an oil refinery near <br />the mouth were damaged. but farms and livestock feet lots in the flood plain suffered the <br />most. <br /> <br />It <br /> <br />Flood of 8 and 9 Mav 1957. A heavy rainstorm occurred over the Sand Creek basin <br />and adjacent areas on EI and 9 May 1957. Over 4.0 inches of rainfall occurred at the <br />storm center. Major floc'ding resuKed on Sand and Toll Gate Creeks. Runoff from the <br />Sand Creek basin caused severe flooding along the South Platte River. The floodwaters <br />in the Sand Creek basin receded in less than 12 hours, but high flow cond~ions along the <br />South Platte River continued for several days as higher than average snowmeK lasted <br />almost to the end of the month. On Sand Creek, near Stapleton International Airport, the <br />flow was estimated to be 25.000 cubic feet per second and upstream from Toll Gate <br />Creek. the Sand Creek clischarge was estimated to be 8.000 cubic feet per second. The <br />Toll Gate Creek discha~le was estimated to be 10,500 cubic feet per second at East 6th <br />Avenue in Aurora, which is about 2 miles upstream from the mouth of Toll Gate Creek. <br />At 6th Street the fast rising flood crest excBeded the capac~y of the culverts and <br />overflowed the roadwayc Water flowing up to 1 c6 feet deep washed out the road bed. <br />Extensive damages were inflicted on homes. util~ies. and bridges. A woman and two <br />children were drowned in a basement apartment by Toll Gate Creek floodwaters. Peak <br />discharge-<Jn the South F'latte River at the Henderson gaging station. located about 7 miles <br />downstream from the mouth of Sand Creek. was estimated to be 12,000 cubic feet per <br />second. <br /> <br />.. <br /> <br />Flood of 16 and 17 June 1965. Heavy to torrential rainfall occurred over the Sand and <br />Toll Gate Creek basins on 16 June 1965. Rainfall averaged 2 to 4 inches over the Sand <br />Creek basin. ResuKing clischarges on Sand Creek were estimated to be 13,400 cubic feet <br />per second at Sable Avenue, located about 0.5 miles upstream from Toll Gate Creek, and <br />18,900 cubic feet per second downstream from Toll Gate Creekc The peak flow on Toll <br />Gate Creek was estimated to be 17.000 cubic feet per second at East 6th Avenue in <br />Aurora. Heavy runoff from Sand and Toll Gate Creeks caused extensive damagB in the <br />Aurora vicin~y and contributed add~ional flood volume to the South Platte 'River north of <br />Denver. Nearly every hiohway and railroad bridge crossing on Sand and Toll Gate Creeks <br />was e~her damaged or destroyed. About 750 acres of land adjoining Sand Creek and 120 <br />acres of land adjoining Toll Gate Creek were inundatedc Flooding along the downstream <br />10 miles of Sand Creek were inundatedc Flooding along the downstream 10 miles of Sand <br />Creek spread to widths ranging between 500 and 1.500 feet. On the downstream 6 miles <br />of Toll Gate Creek, the flood width ranged from 300 to 1,000 feet. Transportation and <br />urban damages on Sandi and Toll Gate Creeks were estimated at $3,OOO.OOOc Add~ional <br />rainstorms in July 1965 seriously hampered recovery efforts and destroyed temporary <br />bridges. These caused basement flooding in Aurora. <br /> <br />. <br /> <br />., <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />4.10 <br /> <br />a:w=r <br />