PBS Engineering and Environmental

Gerber Streambank Stabilization

Location: Oregon

Recent upstream development at the Gerber site had significantly increased the frequency of overbank flooding on the site resulting in the erosion of stream banks and threatening existing paved parking areas and other infrastructure. PBS conducted a stability assessment of the streambank and adjacent paving/structures, assessed possible design solutions and permitting scenarios, and developed engineering and construction cost estimates and a schedule for the project. PBS also coordinated this project with the Oregon Department of Transportation (ODOT) due to the proximity of the stream to the Highway 217 on-ramp to Interstate-5.

The second phase of the project included modeling of stream flows and evaluating low-impact engineering solutions to prevent further erosion and protect the existing parking areas which had been impacted by the bank erosion. PBS worked closely with various regulatory agencies including the City of Tigard, Clean Water Services, U.S. Fish and Wildlife, Oregon Department of State Lands, and the U.S. Army Corps of Engineers to obtain the necessary permits for the project. Our engineered solution incorporated a repair that provided long-term stability to the streambank and adjacent parking area, yet allowed for vegetation and shading of the stream to occur. Our solution met the criteria of all regulatory agencies.

During construction, PBS worked closely with the contractor to implement the design, prevent sedimentation of the stream while working within the stream channel, and the reestablishment of native plants to reduce the potential for further erosion and increase the quality of the upland resource.

Client:
Gerber Legendary Blades Division
Madison, Wisconsin

Scope of Services:

  • Stream Bank Stabilization
  • Geotechnical Engineering/Design
  • Stream Restoration
  • Wetland Mitigation
  • Permitting
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