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<br />In spite of the historical degradation, further downcutting of the Poudre River channellmder <br />existing conditions is considered to be unlikely due to the presence of the bedrock outcrop and <br />diversion weirs throughout the reach. The existence of nwnerous gravel pits along the banks of <br />the Poudre, however, may accentuate lateral channel instability by capture of the river by the <br />gravel pits. The Poudre River Master Plan identifies specific locations of channel stability <br />problems. <br /> <br />III. FLOOD HAZARD INVENTORY <br /> <br />Floodprone Buildings <br /> <br />Under natural conditions, a flood causes little or no darnage. Nature ensures that floodplain flora <br />and fauna can survive the more frequent inundations. Flood problems exist when human <br />development encroaches into the floodplain and is subsequently damaged by nature's flood <br />waters. The City of Fort Collins is a rapidly growing community, and therefore, the flood hazard <br />is constantly changing. <br /> <br />The City has approximately 797 commercial and residential structures in the federally regulated <br />(NFIP) floodplains of the Cache La Poudre, Spring Creek, Dry Creek, Cooper Slough, and <br />Boxelder Creek. There are 191 flood insurance IJolieies currently (1995) in effect. Some <br />structures are at higher risk than others with regard to loss of property and life. The following <br />section describes and inventories the flood hazatd in Fort Collins. The Master Drainageway <br />Plans should be referred to for detailed information on recommended improvement plans and <br />estimated costs for the respective stormwater basins and floodplains. <br /> <br />Cache La Poudre Floodplain <br /> <br />The Poudre River has the largest drainage area of the streams in Fort Collins, 1,129 square miles <br />above Fort Collins, and therefore, the largest relative flood potential. There are approximately <br />2,880 acres within the 100,year floodplain between Illt(:rstate 25 to Taft Hill Road which <br />encompasses the Urban Growth Area (UGA). There are approximately 1,279 acres within the <br />City limits. <br /> <br />There are approximately 220 structmes in the poudre River Floodplain between Interstate 25 and <br />Taft Hill Road (Poudre River Master Plan) which includes some buildings located in the County <br />jurisdiction. An inventory of all properties within the 100-year floodplain, prepared by Resource <br />Consultants and Engineers, Inc. (1995), is based on n:cords obtained from the County Assessor's <br />office. The inventory was prepared by first performing a data base inquiry of the Assessor's <br />records using general descriptions of the 100-year floodplain boundaries based on the I" = 600' <br />scale orthophoto mapping. The inquiry resulted in a listing of all properties within and adjacent <br />to the floodplain. This listing was then refined to identify those parcels that actually fell within <br />the floodplain boundaries delineated on quarter section plat maps. The Master Plan estimates $6 <br />million of property damage that may occur along the Poudre River during the 100-year flood. <br /> <br />25 <br />