8 Jan 2026

Avian Dissuasion at Lower Columbia River Federal Navigation Channel Dredged Material Placement Sites Draft Supplemental Environmental Assessment (DSEA)

Expiration date: 1/23/2026

Interested parties are hereby notified that the U.S. Army Corps of Engineers, Portland District (Corps) is seeking public comment on its Avian Dissuasion at Lower Columbia River Federal Navigation Channel Dredged Material Placement Sites Draft Supplemental Environmental Assessment (DSEA).

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.