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OJJ8U5 Fact Sheet I ~ , i Floodplain Management in Colorado prepared by the Colorado Water Conservation Do~rd July 23, 1981 I I ., .,. ! I 1, Over the past two decades, the floodplain has been identified or is currently being studied on approxi- mately 2,660 miles of Colorado streams, This is only about half of the streams that need to be studied in the state. In the Front Range area alone, about 1,500 miles of hazardous mountain canyons still need to be studied. The Colorado Water Conservation Board has designated and approved 175 floodplain studies since 1963, when the program began. '. 2. In Colorado, the 100-year Or 1 percent chance flood has been selected as the standard for floodplain man- agement. That is also the national standard, adopted by the Federal Emergency Management Agency for its National Flood Insurance Program. 3. Flood insurance is available to approximately 95 per- cent of the residents of Colorado. 199 counties, cities, and towns are currently enrolled in the National Flood Insurance Program 75 counties, cities, and towns are not currently enrolled in the National "Flood Insurance Program and have local floodplain conditions that warrant such enroll- ment In 52 cities and towns are not currently enrolled in the National Flood Insurance Program and do not have sufficient flood hazard to require such enrollment 326 TOTAL counties, cities and towns in ColoradO 4, Maior Completed Federal Flood Control Proiects Date of Construction Construction Cost . Name Flood Contro Benefits ' , River John Martin Reservoir 1948 15,250,000--+ 73,000-,000' 1953 Tot, Fed. 14,770,000 ~157,000,000' Cost eek Cherry Creek Res. e River Chatfiel~_Res~rvoir 1975 89,800,000 e River 1977 45,000,000 Trinidad Reservoir k 1979 +65,000,000 13cnr Creek H.e::;. nefits were calculated after the June, 1965.floods; they represent e~ derived during the 1965 floeds. - ---_._..' . ,