Springbrook Creek Fish & Wildlife Passage & Channel Restoration

Springbrook Creek Fish and Wildlife Passage Design, Permitting, Barrier Removal, and Stream Channel RestorationHENDERSON environmental design-build professionals were selected by the City of Lake Oswego to design, permit, and construct the Springbrook Creek Fish and Wildlife Passage Restoration Project.  Springbrook Creek is a three-mile long, second-order, perennial stream with ten tributaries, draining 1,219 acres of urbanized watershed within the City.  HENDERSON’S efforts focused on the restoration of fish and wildlife passage within two reaches of Springbrook Creek.

HENDERSON’S restoration design elements included removal of fish and wildlife passage barriers, design and construction of modular recycled-plastic fish-passage structures within a 120-foot existing railway culvert, elimination of embankment erosion, rebuilding a stable channel configuration above and below these culverts, prevention of further thalweg downcutting, re-building a native-material streambed with fish-spawning gravels, and generally increasing utilization of this stream reach as fisheries habitat.  Our professionals modified existing stream channels alignment to create a dimension, pattern, and profile that are in equilibrium with present conditions in the watershed.  As a result, these reaches of Springbrook Creek have seen significant improvement of Springbrook Creek Fish and Wildlife Passage Design, Permitting, Barrier Removal, and Stream Channel Restorationriparian and aquatic habitat for native fish and wildlife through removal of fish and wildlife passage barriers, creating natural habitat features, and by increasing the diversity and vigor of native riparian vegetation.  Further, in these urbanized stream reaches, HENDERSON was able to successfully reconnect stream flows to the historic micro-floodplain while preventing flood damage to existing residences, and raising the natural water table to support riparian vegetation and increased summer base hydrologic flows.

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