The Blind Slough project is located in the Brownsmead area approximately three miles northeast of Knappa, Oregon, and 17 miles east of Astoria, Oregon. The project area encompasses sloughs located in diked lands of Clatsop Diking Improvement Companies No. 7 and 1. Blind Slough’s proximity and historic connection to the biologically productive and physically complex Cathlamet Bay island network increases its ecological importance for restoration. Blind Slough is located in the oligohaline zone located in the tidal area between Horseshoe Island (RM 29) and Tongue Point (RM 18). The oligohaline zone has been identified as a critical staging area for subyearling salmon when they first encounter and must acclimate to saltwater. (D. Bottom, et al. 2001)
The overall goal of the project was to restore tidal connection between the Columbia River Estuary and Blind Slough through the replacement and/or installation of culverts, installation of water control devices, breaching of dikes, and channel enhancement. These enhancements would restore connectivity to approximately ten (10) miles of slough channels previously isolated from tidal influence due to dikes, road crossings, and constrained culverts. This project was a joint effort partnering CREST, Clatsop Diking Improvement Company No. 7, U.S Army Corps of Engineers Portland District, Bonneville Power Administration, U.S. Fish and Wildlife Service, Lower Columbia River Estuary Partnership, Northwest Power Planning Council, Nicolai Wickiup Watershed Council, North Coast Watershed Association, and Sea Resources Watershed Learning Center.