Tryon Creek at SW Boones Ferry Road Culvert Replacement

CulvertHENDERSON design-build professionals, as part of BergerABAM’s project team to the City of Portland Bureau of Environmental Services (BES), are providing stream assessment, hydraulic analysis, fish passage analysis and design, embankment stabilization and stream restoration design, pedestrian trail design, construction access feasibility, and value-engineered cost estimations to provide fish passage upstream of SW Boones Ferry Road into the Upper Tryon Creek basin while meeting all applicable design criteria for conveyance of design flows. Tryon Creek flows from the southwesterly portion of Portland to the southeast, into Willamette River in the City of Lake Oswego.

Oregon’s 645-acre Tryon Creek State Natural Area encompasses Tryon Creek above and below Boones Ferry Road. Safe pedestrian access through the Boones Ferry Road intersection with Tryon Creek, connecting the upstream and downstream portions of the Park is another critical design element to be integrated into this fish passage design effort.

Tryon Creek flows under Boones Ferry Road through an existing 60-inch diameter corrugated metal pipe (CMP) culvert approximately 140 feet in length. At low stream flows, there is a fish-passage barrier at the outfall of this culvert invert to the downstream pool elevation. A grated concrete debris rack located at the upstream end of the culvert has a vertical drop that blocks all upstream fish passage during normal flows. During high flows, velocities within the culvert prevent upstream passage of fish. The Boones Ferry culvert has been identified by the City of Portland as one of two major fish passage barriers on the main stem of Tryon Creek. The Oregon Department of Fish and Wildlife has prioritized removal of the remaining fish passage barriers on Tryon Creek as some of the greatest opportunities in Oregon to restore access to significant fish habitat into a local watershed. Restoration would reconnect approximately eight miles of Tryon Creek to year-round passage of fish and other aquatic species, improving in-stream and riparian habitat for fish and wildlife.

HENDERSON was selected to join BergerABAM’s team for our specific design and construction familiarity within the Tryon Creek watershed and with the involved stakeholders, our broad design experience with stream channel/habitat restoration coupled with our value-engineering and constructability expertise in sensitive habitats, and our extensive experience with permitting of projects in environmentally sensitive areas and ESA (fish) listed waters.

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