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The Washington State Department of Transportation and the Cowlitz-Wahkiakum Council of Governments proposed to improve the Interstate 5/State Route 432 (SR 432) interchange and the SR 432/Talley Way interchange to improve safety, create better connections to existing roads, increase capacity, and decrease congestion. BergerABAM conducted a planning-level inventory and assessment for the corridor to aid in the development of viable alternatives. The loss of wetlands/open water and potential construction impacts to fish due to construction of a new bridge over the Coweeman River, as proposed in an alternative, emerged as the issues most significant to stakeholders and agencies. To address these concerns, staff also prepared a wetland delineation report for compliance with Section 404 and Section 401 of the Clean Water Act, a natural resource technical report for the documented National Environmental Policy Act categorical exclusion, and a biological assessment to comply with the Endangered Species Act.