Floodplain Information Report Volume 4 Colorado River Mainstem from Rifle to the Utah Stateline

I; 1 1 it L I Preface The Colorado Water Conservation Board, under contract to the Bureau of Reclamation, has prepared Floodplain Information Reports for four subbasins of the Upper Colorado River Basin. The reports have been divided into four separate volumes, one for each subbasin: Volume 1, the Yampa River (from Craig, Colorado, downstream to Dinosaur National Monument); Volume 2, the White River (from Rio Blanco Lake downstream to the Utah stateline); Volume 3, the Gunnison River (from Delta, Colorado, downstream to its mouth); and Volume 4, the Colorado River mainstem (from Rifle, Colorado, downstream to the Utah stateline). Figure 1 on the next page shows the four stream reaches of critical habitat in the Upper Colorado River Basin. This Floodplain Information Report, Volume 4, presents the results of a study for the delineation of the 50 -year and 100 -year floodplains on the reach of the Colorado River mainstem from Rifle, Colorado, downstream to the Utah stateline. The reach is part of the designated critical habitat in the Upper Colorado River basin. The critical habitat was designated by the U.S. Fish and Wildlife Service. The report was prepared to provide floodplain information for the Colorado River to agencies, municipalities, development entities and private citizens for use in land use planning and in meeting Section 7 and NEPA- related requirements regarding the endangered fishes of the Upper Colorado River basin.