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<br />watersheds to the east. Flooding occurred on the South Platte River from Plum Creek <br />downstream to North Platte. Nebraska as a result of this rainfall. <br /> <br />Flood of 1969. Heavy rains during this period started on the afternoon of 4 May and <br />continued with only intermittent breaks until 8 May. The storm covered an area along and <br />near the eastern slopes of the mountains and ex1ended into portions of the high plains. <br />The heaviest amounts were centered 25 miles 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 5.77 inches. <br />General flooding resulted along the South Platte River, <br /> <br />I' <br /> <br />Flood of 1973. Snowmelt runoff from the lower mountain area of the-South Platte River <br />basin began about the middle of April. Rainfall amounting to as much as 6 inches. which <br />was the major causative factor of the flooding in the South Platte River basin, began on <br />5 May. Sharp increases in flow as a result of the rainfall runoff were recorded at all gaging <br />stations along the South Platte River from Littleton to the Colorado-Nebraska State line. <br />The rainfall runoff was augmented by mountain snowmelt runoff Which was also increasing <br />during this period. The result was general flooding throughout the South Platte River <br />basin; flooding was characteri~ed by high, sharp hydrograph peaks from the rainfall runoff <br />followed by a slow recession because of the continuing mountain snowmelt runoff. <br />Bankfull discharges were experienced along portions of the main stem of the South Platte <br />River for most of the month of May and on into June. Major South Platte River tributary <br />streams that experienced flooding or that contributed to flood flows on the South Platte <br />River are Bear Creek, Cherry Creek downstream from the dam, Clear Creek, Sl Vrain <br />Creek, Big Thompson River, and Cache la Poudre River. <br /> <br />4.1 PAWNEE CREEK <br /> <br />Flood Historv. Accounts of flooding along Pawnee Creek are not abundant. Since <br />several floods have undoubtedly occurred, the apparent lack of flood data Is probably the <br />result of the rural nature of Pawnee Creek. Residents of the Pawnee Creek area, <br />however, indicate that flooding occurs about once every 5 to 10 years along Pawnee <br />Creek. Available flood accounts indicate flooding did occur in 1883, 1894, 1914, 1921 , <br />1935, and 1965. <br /> <br />4.2 BIJOU CREEK BASIN <br /> <br />Flood History. Floods in the Bijou Creek Basin have occurred as the result of runoff <br />from high intensity rainfall over a relatively small portion of the drainage area. Records do <br />not indicate any major flooding from snowmelt runoff. The two record flood events that <br />have occurred in the Basin are described in the following paragraphs. <br /> <br />Colorado Flood <br />Hydrology Manual <br /> <br />4.3 <br /> <br />a:w=r <br />