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<br />Flood of 1938. Heavy rainfall during the period from 30 August to 4 September over <br />much of the upper South Platte River basin caused flooding on many of the mounfain <br />streams tributary to the South Platte as well as the South Platte itse". Relatively minor <br />flooding was reported on the South Platte River. <br /> <br />. <br /> <br />~ <br /> <br />Flood of 1942. The flood of April-May on the South Platte River and tributary streams <br />was the result of snowme~ runoff being augmented by heavy precipnation during the last <br />ha" of April and the first part of May. The mountain area aboVB Chatfield Dam produced <br />most of the volume that passed the Denver gage and, a~hough peak values during this <br />flood were not high in comparison to other floods, the volume of runoff was excessive, wnh <br />a 30-day runoff of 265,000 acre-feet flowing past the Denver gage and a 60-day runoff of <br />395,000 acre-feet. Four separate flood crests occurred at the Denver gage wnh the <br />maximum peak of 10,200 cubic feet per second recorded on 25 April. Peak flows in <br />excess of 8,500 cubic feet per second were, however, recorded on 19, 23 and 30 April. <br />The minimum flow at Denver during the 24 day period-from 19 April to 13 May was about <br />4,500 cubic feet per second. <br /> <br />Flood of 1948c Heavy rainfall over a large area east of Denver caused flooding in late <br />May and early June on the South Platte River between Sand Creek and Fort Lupton. <br />Several approaches to county bridges were washed out as well as flooding of some <br />agricultural land. <br /> <br />Flood of 1949. Heavy rainfall over a me~ing snowpack caused flooding on the South <br />Platte River from mid-May to late June from Littleton, Colorado to North Platte, Nebraska. <br />Considerable damage was incurred by homes, farm buildings, and crops along that reach <br />of the river. <br /> <br />Flood of 1957. Intense local rains over the Sand Creek basin caused flooding on the <br />South Platte River for a distance downstream from Sand Creek. High rural damages were <br />incurred in some locations. <br /> <br />Flood of 1965. Heavy to torrential rainfall over large portions of the South Platte River <br />basin created extensive flooding along the South Platte River. Heavy rainfall occurred over <br />portions of the northern sections of the South Platte River basin on the 14th and 15th of <br />June. As the storm system moved southward, torrential rainfall of the period extended <br />over some 3,000 square miles of the South Platte 'River basin, including the Plum Creek, <br />Cherry Creek, and Sand and Toll Gate Creek watersheds in the Denver region, and the <br />Bijou Creek, Kiowa Creek, Commanche CrBek, Bader Creek, and Beaver Creek <br />watersheds to the east. Flooding occurred on the South Platte River from Plum Creek <br />downstream to North Platte, Nebraska as a resu~ of this rainfall. <br /> <br />. <br /> <br />Flood of 1969. Heavy rains during this period started on the afternoon of 4 May and <br />continued wnh only intermittent breaks until 8 May. The storm covered an area along and <br />near the eastern Slopes of the mountains and extended into portions of the high plainsc <br />The heaviest amounts were centBrBd 25 milBs southwest of Denver and extended in a <br />band along the foothills northward to near Estes Park. The weather station at Morrison <br />reported a total storm rainfall of 11 .27 inches and a maximum daily amount of 5. n inches. <br /> <br />, <br /> <br />. <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />4.3 <br /> <br />fRt'Fr <br />