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~, Boxelder Creek has a long history of flooding. Floods of record occurred in 1904, 1909, 1922, 1924, 1930, 1933, 1937, 1947, 1961, 1963, 1965, 1967, and 1969. The majority of structures within this floodplain are commercial and outside of the City limits, although there is one pre-FIRM structure within City limits. There are approved plans for a residential subdivision in the drainage basin, although the area is not mapped in the Special Flood Hazard Area (SFHA). 6. Dam Failure Dam failure poses another threat to Fort Collins. Larimer County has 45 Class I (high hazard) and 42 Class II (moderate hazard) dams. Thankfully, no dams failed in the extreme event of 1997, but Fort Collins must remain aware of the flooding potential from dams. 7. Urban Flash Flooding .--.. Urban flash flooding is a well-known flood hazard in Fort Collins due to its propensity for very intense localized storms. Major historic rainfall events in Fort Collins with the year of occurrence shown in parentheses include 1.71" (1899), 6.22" (1902),4.03" (1904), 2.82" (1918), 2.70" (1933), 4.88" (1938), 3.72" (1949), 2.95" (1951), 6.06" (1951), 2.45" (1961), 2.41" (1965), 4.3" (1977), 1.4" (1983), 1.51" (1988),2.49" (1992),14.5" (1997), 4.15" (1999). These values are storm totals and were not all measured at the same location. In the storm of 1938, many of those in the Old Town neighborhood turned out to help divert overflowing water into Mountain A venue and Oak Street where the water ran into sewer openings at each corner as far east as Shields Street. A basement apartment flooded at 416 Locust Street. It was reported that all basements in houses on the 800 block of Whedbee Street were flooded, as were basements in the 500 block on Pitkin Street. The storm of 1951 put an estimated 400 telephones, out of service. Power lines were also out around town for the day. Water running in at the south ramp of the county hospital covered the first floor hallway and several wards to a depth of about one- inch. About 28,000 envelopes were destroyed at the Fort Collins Post Office postal stock. Flooding at Plum and Locust streets caused nUmerous basements to be flooded. Flooding of basements in homes on laPorte Avenue was also reported. Approximately $270,000 damage occurred to Colorado A&M Campus (CSU) from overflowing irrigation ditches west of campus. The July 25 1977 storm caused localized urban flooding of streets and buildings. The storm of July 7, 1988 was a significant storm in the downtown area. The June 24, 1992 storm was estimated to be a 20-year event, with the majority of rainfall occurring in 30 minutes. Storm sewers, unable to handle the volume of water, caused many streets to flood. Several businesses and private residences sustained flood damage. mainly to basement levels. The flooding affected the older 12