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-5- + I I I I I I I I I I I I I I I I I I I Other publi~hed information on the potential extent of floodiny within the study area has been complQtc~ by the following priv~tc consultants: ~U!..l!{!!~'......:.ln<J :><:"0.1:<1 1. Gingery Associates, rnc. I Flood Plain Analysis, CoLorado River from West Glenwood Springs Interchange to Access Bridge to Railroad Yards area. '!'hill r"port wall I'n'p'H,.<J LO '1~il!<.' 10<:<11 orri,.j,'I" i'l I,l....nnin.l the use ilnd requl<~ti(JfJ of the flood pl.,10 "H d"fliqnClted Hr. that flood hazards and future flood damages arc minimized. The report includes information on historical floods, factors which influence these flood hazards and the nature and extent of probable future floods. The report data includes flooded area maps delineating the 100 year flood boundary, flood profiles and flood plain cross sections showing the high water elevations for the 10, 50, 100, and 500 year floods at selected reference points. Information is alSb included on the peak flow of the Colorado River and Roaring Fork River for June 15, 1973, which has been adopted by the City of Glenwood Springs for implementation of a 30 foot setback limit. A supplement to this report in the form of a Technical Addendum includes the supporting engineering and hydrologic data and computations. 2. Eldorado Engineering Company, unpublished Flood Plain analysis for sewage treatment plant at junction of rivers. 3. Eldorado Engineering Company, unpublished FlOOd Plain analysis, sewage treatment plant site on COlorado River, Chatfield Property. The Sacramento District Corps of Engineers has com9leted a Flood Insurance Study for certain unincorporated areas of Garfield County for the Federal Insurance Administration (reference 1). The study docs not overlap the study area for this report, but docs match to the upper limit of this study on the Roaring ~'ork River. The study established flood flows on the Colorado River and Roaring Fork Rivers in the study area. The flood discharges established by the Corps of Engi- neers havo been adopted for this report. For additional in- formation concerning hydrology on the rivers, refer to the FlOOd Insurance Study. The results presented herein are to be considered authorita- tive for purposes of flood plain information and flood plain management. Acknow1edqements The assistance and cooperation of the agencies, firms, and organizations listed below, as well as the many private citizens who supplied information and data, is appreciated and gratefully acknowledged. City of Glenwood Springs, City Council and Staff Colorado Water Conservation Soard Garfield County Board of County Commissioners and Staff Colorado State Highway Department Eldorado Engineering Company U.~. Army Corps of Engineers, Sacramento, California Glenwood Post Daily Senti.nel Aorlal Photography and contour mappings were provided by the City of Glenwoocl Sprinqs dnd prepared by MerriCk and CQ~pany and u,s. Geological Survey cefpectively. k; lilL(.J Flood Studies --- N~ rrcviou~, detailed study data or reports have been published conC<'llling the potential flood hazi'rds on the Roaring Fork River and (',.,1'-'''<1<10 River in the area in and around Glenwood Springs, Color~Jo by government agencies. Approximate boundaries of flood pro~e areas, however, hav~ been delineated by the U.S. Depdrtmpnt of Housing and Urban Development and Federal Insurance Administration. These flood boundaries have been delineated on l~~2,000 foot scale topographic maps. The approximate flood Limits identified on the flood prone area maps prepared by the federal Insurance Administration are normally somewhat wider than the actual flood plain area determined in this report, I