Lower Willamette River Environmental Dredging and Ecosystem Restoration Project
LOWER WILLAMETTE RIVER ENVIRONMENTAL DREDGING AND ECOSYSTEM RESTORATION PROJECT INTEGRATED FEASIBILITY STUDY AND ENVIRONMENTAL ASSESSMENT DRAFT FINAL REPORT March 2015 Prepared by: Tetra Tech, Inc. 1020 SW Taylor St. Suite 530 Portland, OR 97205 This page left blank intentionally EXECUTIVE SUMMARY This Integrated Feasibility Study and Environmental Assessment (FS-EA) evaluates ecosystem restoration actions in the Lower Willamette River, led by the U.S. Army Corps of Engineers (Corps) and the non-Federal sponsor, the City of Portland (City). The study area encompasses the Lower Willamette River Watershed and its tributaries, from its confluence with the Columbia River at River Mile (RM) 0 to Willamette Falls, located at RM 26. The goal of this study is to identify a cost effective ecosystem restoration plan that maximizes habitat benefits while minimizing impacts to environmental, cultural, and socioeconomic resources. This report contains a summary of the feasibility study from plan formulation through selection of a recommended plan, 35% designs and cost estimating, a description of the baseline conditions, and description of impacts that may result from implementation of the recommended plan. This integrated report complies with NEPA requirements. Sections 1500.1(c) and 1508.9(a) (1) of the National Environmental Policy Act of 1969 (as amended) require federal agencies to “provide sufficient evidence and analysis for determining whether to prepare an environmental impact statement or a finding of no significant impact” on actions authorized, funded, or carried out by the federal government to insure such actions adequately address “environmental consequences, and take actions that protect, restore, and enhance the environment." The Willamette River watershed was once an extensive and interconnected system of active channels, open slack waters, emergent wetlands, riparian forests, and adjacent upland forests.
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