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(Reference 6). The snowmelt runoff from 1983 produced a peak near 7,000 cfs. This was the highest peak in 53 years. Extensive channel damage occurred because of the prolonged duration of the runoff. Buckhorn Creek has flooded on several occasions. The largest floods were in 1923, 1938, '1948, and 1951 with discharges of 10,500, 10,200, 5,750 and 14,000 cfs, respectively (Reference 7). Documentation of floods on Redstone Creek is relatively sparse. However, an intense rainstorm on September 10, 1938, caused flooding in some of the lower areas of the flood plain (Reference 7). Floods have been recorded in. the Boxelder Creek watershed on 13 occasions since 1900. On August 1, 1961, a storm with a frequency of 50 to 100 years caused an estimated $76,150 in damage in the Wellington vicinity. In May and June 1976, two overlapping 25-year storms caused an estimated $46,100 in damage and took four lives in the Wellington vicinity (Reference 8). . No record exists of a major flood on Dry Creek in the study area. The absence of even minor flooding is generally attributed to the network of irrigation canals that have some capacity for intercepting Dry Creek flows (Reference 1). Fish Creek and the Fall River have not often been subject to major flooding, although the Fall River did overflow its banks in 1965 and cause some damage. In July 1982, extensive damage occurred throughout the Town of Estes Park because of the failure of Lawn Lake Dam located in the headwaters of the Fall River. 2.4 Flood Protection Measures There are no structures along the Big Thompson River or its tributaries that provide a major reduction in floodflows. Numerous levees along the river will contain a high frequency flood (10 and 25 years) but provide little protection against the 100-year flood. In 1970 the U.S, Soil Conservation Service (SCS) proposed to construct five floodwater detention structures in the Boxelder Creek basin. Two of these structures were completed when discharges were computed for the detailed analysis for Boxelder Creek. There are no flood-control structures located in the Cooper Slough basin (Reference 9). Although they are not actual flood-control structures, Dry Creek nas-several lakes and storage reservoirs that reduce the contributing drainage area by approximately 13 percent. The network of irrigation canals in the Dry Creek basin has some capacity for iutercepting Dry Creek flows (Reference 1). Douglas Lake, al.o an irrigation reservoir, significantly reduces peak discharges. 10