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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 hours on the lower basin of Sand and Toll Gate Creeks. Flooding
<br />resu"ed downstream of Colfax Avenue, Estimated discharges on Sand Creek of 7,720
<br />c,f,s, and 10,500 c,l.s,. respectively, at Colfax Avenue and at the mouth caused overbank
<br />stages from 4 to 8 feet deep, Tourist cabins near Colfax 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 />Flood of 8 and 9 Mav 1957, A heavy rainstorm occurred over the Sand Creek basin
<br />and adjacent areas on 8 and 9 May 1957, Over 4,0 inches of rainfall occurred at the
<br />storm center, Major flooding resulted 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 conditions along the
<br />South Platte River continued for several days as higher than average snowmelt 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 discharge was estimated to be 8,000 cubic feet per second, The
<br />Toll Gate Creek diSCharge 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 exceeded the capacity of the culverts and
<br />over1lowed the roadway, Water flowing up to 1,6 feet deep washed out the road bed,
<br />Extensive damages were inflicted on homes, utilities, and bridges, A woman and two
<br />children were drowned in a basement apartment by Toll Gate Creek floodwaters, Peak
<br />discharge-on the South Platte 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 />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, Resu"ing discharges 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 Creek, 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 damage in the
<br />Aurora vicinity and contributed additional flood volume to the South Platte 'River north of
<br />Denver, Nearly every highway and railroad bridge crossing on Sand and Toll Gate Creeks
<br />was either damaged or destroyed, About 750 acres of land adjoining Sand Creek and 120
<br />acres of land adjoining Toll Gate Creek were inundated, Flooding along the downstream
<br />10 miles of Sand Creek were inundated, 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 Sand and Toll Gate Creeks were estimated at $3,000,000, Additional
<br />rainstorms in July 1965 seriously hampered recovery efforts and destroyed temporary
<br />bridges, These caused basement flooding in Aurora,
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<br />Colorado Flood
<br />Hydrology Manual
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<br />4,10
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