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<br />Floods occurred on Spring Creek in 1902, 1904, 1938, 1949, 1951, 1975, 1977, 1983 <br />and 1997. During the July 1997 event, the Spring Creek drainage basin within the <br />City of Fort Collins received the most intense rainfall and was the site of <br />considerable damage. It is estimated that the July 28th flood was greater than a 500- <br />year event. <br /> <br />Since 1990, , the City of Fort Collins completed a series of channel and floodplain <br />improvements along Spring Creek for flood protection (IOO- year design) and <br />recreation. The multiple projects removed a number of properties from the flood <br />hazard area. <br /> <br />3. Dry Creek <br /> <br />Dry Creek is a left bank tributary of the Cache La Poudre River and has a drainage <br />area of about 65 square miles. Dry Creek flows south through the northeast portion <br />of Fort Collins before joining the Cache La Poudre River south of Fort Collins <br />Airpark. In the upper portion of the basin, the stream is steep, narrow, and deeply <br />incised with active headcutting. Lower in the basin, the Dry Creek channel is <br />relatively stable with wide, shallow floodplains except in Fort Collins where the <br />channel does not exist in several areas. Extensive pre-FIRM commercial and <br />residential development is located within the Dry Creek floodplain and floodway. <br /> <br />.- <br /> <br />Flooding occurred in Dry Creek in 1904 and 1924 with flows several feet deep. <br />Presently, the impact of new development in the lower basin of Dry Creek is already <br />increasing the magnitude and frequency of drainage flows. In the past, irrigation <br />canals intercepted much of the excess drainage. Today, these canals no longer have <br />the capacity to intercept larger flood flows and increased drainage flows. <br /> <br />4. Fossil Creek <br /> <br />Fossil Creek is a right bank tributary of the Cache La Poudre River with a drainage <br />area of approximately 2 I square miles. It flows from east to west through Fort <br />Collins. The Fossil Creek channel is generally incised and characterized by bed and <br />bank instability and meander migration and channel cutoffs. <br /> <br />Floods occurred in Fossil Creek in 1902, 1938, 1965, 1977, 1979 and 1997 with little <br />damage since the basin was relatively undeveloped. Major new development is now <br />occurring in this region, however, adherence to new drainage criteria in planning and <br />construction has lowered the flooding hazard in this basin. <br /> <br />5. Boxelder Creek and Cooper Slough <br /> <br />Boxelder Creek is a left bank tributary of the Cache La Poudre River and has a <br />drainage basin that covers an area of 251 square miles in Wyoming and Colorado. <br />Boxelder Creek flows along the northeast edge of Fort Collins and joins the Cache La <br />Poudre River at the eastern boundaries of the City. <br /> <br />11 <br />