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Title: Columbia River Channel Improvement Project : Final Supplemental Integrated Feasibility Report and Environmental Impact Statement, Volume 1
Authors: United States. Army. Corps of Engineers. Portland District
Keywords: Columbia River
Channels (Hydraulic engineering)
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. Portland District.
Abstract: The Columbia River Channel Improvements Project was originally presented in the Final Integrated Feasibility Report for Channel Improvements and Environmental Impact Statement, dated August 1999. In December 1999, Congress authorized the deepening of the Columbia and Lower Willamette Rivers Federal Navigation Channel to 43 feet. The authorized plan modifies the existing federal navigation project for the Columbia and Willamette Rivers and provides for construction of ecosystem restoration features. The purposes of this Final Supplemental Integrated Feasibility Report and Environmental Impact Statement (Final SEIS) are to document additional information, environmental analyses, and project modifications resulting from consultation of the project under Section 7 of the Endangered Species Act; to update the disposal plan; to update the project economics; and to comply with National Environmental Policy Act (NEPA) requirements and with the Washington State Environmental Policy Act (SEPA). Several additional ecosystem restoration features and evaluation actions are proposed for implementation to benefit the recovery of listed salmonids and other fish and wildlife resources, to avoid impacts to marine resources by ocean disposal of channel material, and to retain sand in the estuary. Creating these restoration features will use sand that would have been disposed of in the Deep Water Site. Under the revised plan, the need for ocean disposal is delayed for at least 20 years following construction. Construction volumes were updated using 2001-2002 hydrographic survey data. Other items updated include a reduction in rock excavation; utility relocations; additional information for crab, smelt, sturgeon, and fish stranding gained from data collection conducted with federal and state resource agencies; additional information on sediment transport and consistency with coastal programs; and modification to some of the upland disposal sites to avoid impacts to resources and habitat. Project economics are reexamined to evaluate the sensitivity of the fleet and commodity forecasts, and changes to shipping operations in the Portland area. Although the lower Willamette River was originally addressed in the August 1999 final report, and included in the Congressional authorization, this portion is not addressed in detail in the Final SEIS. The project features for the lower Willamette River will be reevaluated in a subsequent NEPA document after resolution of cleanup issues associated with its being named to the federal National Priorities List by the USEPA under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
Description: Supplemental Integrated Feasibility Report and Environmental Impact Statement
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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