Location: Portland, Oregon
Client: City of Portland
Contract Value: $250,000

The project site was located two miles upstream of the confluence area of the Willamette and Columbia rivers on a small tidal slough called lower Columbia Slough. The work was performed during the in water work window for the slough which was July 15th – September 15th, 2005. The general elements of the work included removal of a fish passage barrier, alcove enhancement, historic slough channel reconstruction, and backwater habitat enhancement. AEC performed initial tree clearing and began removing the concrete weir/fish barrier and the manmade berm/earthen dam in the southern end of the project area. Once the fish passage barrier was removed, excavation of soils began in the southern end of the site to enlarge and enhance the existing alcove area. AEC excavated 10,000 yards of soil excavation to create the 950 foot long x 150 feet wide salmon spawning habitat. Excavation moved northward to reconnect the historic slough channel and backwater habitat area to the north. In addition, streambanks were laid back at a maximum slope of 3:1, and instream habitat was enhanced with 140,000 sq ft of eroision protection and placment of large wood/rootwads for environmental protection. Strict rules and regulations associated with in water work were diligently followed by AEC during this project.

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