Little Colorado River, Winslow, Arizona May 2016
US Army Corps of Engineers® Los Angeles District LITTLE COLORADO RIVER WINSLOW, ARIZONA FLOOD RISK MANAGEMENT PROJECT DRAFT INTEGRATED FEASIBILITY REPORT WITH ENVIRONMENTAL IMPACT STATEMENT May 2016 This page left blank for duplex printing Little Colorado River Winslow, Arizona Flood Risk Management Project Draft Integrated Feasibility Report (Feasibility Report/Environmental Impact Statement) Navajo County, Arizona Lead Agency: U.S. Army Corps of Engineers, Los Angeles District (Corps). Abstract: This Draft Integrated Feasibility Report (Draft IFR) evaluates alternatives to reduce the risk of damages and to reduce the life, safety, and health risks caused by flooding of the Little Colorado River (LCR) to the City of Winslow, surrounding community, and public and private infrastructure. The Draft IFR documents the plan formulation and environmental impact analysis conducted by the Corps in close cooperation with Navajo County Flood Control District, the non-Federal sponsor for this study. The LCR at Winslow study area is located in the middle of the LCR Watershed, in and near the City of Winslow in western Navajo County, Arizona. The study area includes the floodplain of the LCR from the Clear Creek confluence downstream (northwest) to the northern end of the existing Winslow Levee. The 49-square-mile study area encompasses the City of Winslow, including the Ruby Wash Diversion Levee, and portions of unincorporated Navajo County. Alternatives include various combinations of structural and non-structural measures such as reconstruction of portions of the existing Winslow Levee and Ruby Wash Diversion Levee, levee setbacks, flood warning system and elevation of residential structures, and river channel conveyance improvements. The IFR evaluates the No Action Alternative and ten action alternatives, Alternatives 1.1, 3.1, 7, 8, 9, 10, 10.1, 10.2, 10.3, and 10.4, in detail.
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