Scappoose Sewer Pipe Bank Stabilization - Aquatic Contracting

Scappoose, OR

Aquatic Contracting (AC) was contracted by the Columbia Soil and Water Conservation District to stabilize eroding and vertical streambanks on South Scappoose Creek that had exposed a segment of the City_s sewer line. The exposed, slip-joint round concrete pipe needed to remain active during bank stabilization efforts. AC was tasked with temporary stabilization of the pipe and carefully working to install both riprap and large wood, as required by the project permits, to stabilize over 100 feet of the adjacent streambank. AC began by establishing construction access, installing all erosion control measures, isolating the in-water work area, and importing riprap and large wood (stick logs and root wad logs) to the staging area and excavating and stockpiling topsoil for later replacement. As required by the project permits, AC incorporated 30 logs to create large wood habitat structures to improve fish habitat in conjunction with the 750 tons of riprap required to stabilize the eroding streambank and protect the sewer line. To facilitate native tree and shrub growth along the upper reach of the stabilized bank AC installed multiple geotextile encased topsoil wraps, planted 800 willow cuttings throughout the restored bank reach, and seeded and mulched all temporarily disturbed areas.

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