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City of ForI Collins Hazard Mitigation 404 Grant Application and Colorado. Boxelder Creek flows along the northeast edge of Fort Collins and joins the Cache La Poudre River at the eastern boundaries of the City. 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 Darn failure poses another threat to Fort Collins, Larimer County has 45 Class I (high hazard) and 42 Class II (moderate hazard) dams. Thankfully, no darns failed in the extreme event of 1997, but Fort Collins must remain aware of the flooding potential from dams. 7. Urban Flash Flooding Buildings subject to urban flash flooding are excellent candidates for floodproofing due to the nuisance of reoccurring shallow 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), 43" (1977), 1.4" (1983), 1.51" (1988), 2-49" (1992), 14.5" (1997), 4_15" (1999). In storm of 1938, many of the people who were in the Old Town neighborhood turned out to help divert overflowing water into the streets where it ran into sewer openings at intersections. Many basements in Old Town were flooded in the storm. In the storm of 1951, 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 on LaPorte A venue, Plum and Locust streets caused numerous basements to be flooded. 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 15