1 May 2026

Availability of Final Environmental Impact Statement (Final EIS) for the Lower Columbia River Channel Maintenance Plan and Final Integrated Dredged Material Management Plan (DMMP)

Expiration date: 5/30/2026

The U.S. Army Corps of Engineers, Portland District announces the availability of the Final Environmental Impact Statement (Final EIS) for the Lower Columbia River Channel Maintenance Plan and Final Integrated Dredged Material Management Plan (DMMP), prepared in accordance with the National Environmental Policy Act (NEPA). The Notice of Availability for the Final EIS is published in the Federal Register at: https://www.federalregister.gov/documents/2026/05/01/2026-08520/environmental-impact-statements-notice-of-availability . The Final EIS is available for public review on the USACE Portland District website at: https://www.nwp.usace.army.mil/lcrchannelmaintenance/ .

13 Feb 2026

FONSI: Avian Dissuasion at Lower Columbia River, Federal Navigation Channel, Dredged Material Placement Sites

The U.S. Army Corps of Engineers, Portland District (USACE) has developed an environmental analysis in accordance with the National Environmental Policy Act of 1969, as amended.

7 Oct 2024

Public Notice of proposed discharges of dredged and fill material for the Lower Columbia River Channel Maintenance Plan, Dredged Material Management Plan Oregon and Washington state

Expiration date: 11/6/2024

Interested parties are hereby notified that the U.S. Army Corps of Engineers, Portland District (Corps) proposes to discharge dredged and fill material during implementation of a Dredged Material Management Plan and integrated Environmental Impact Statement (DMMP-EIS) for the purpose of maintaining the congressionally authorized channel dimensions of the Lower Columbia River (LCR) Federal Navigation Channel (FNC), part of the Columbia and Lower Willamette Rivers (C&LW) Project.

31 Oct 2022

Advanced Maintenance Dredging Plan Moving Forward - Finding of No Significant Impacts Signed

Advanced maintenance dredging at the confluence of the lower Columbia and Cowlitz rivers to reduce risk to users by providing reliable passage of commercial and recreational traffic can proceed following a finding of no significant impact to the environment.