Peter Western Bridge Replacement
- Services Bridge Engineering, Civil Engineering, Construction/Project Management, Transportation Engineering
- Market(s) Bridges, Natural Environments, Roadway
- Owner City of Burien
- Contractor Hamilton Construction
- Team Seattle, WA
KPFF completed a bridge alternative study and final design services for the emergency replacement of a multi-span, 180-foot bridge that had sagged from major foundation scour. Steep slopes and an underlying pressurized aquifer were present under the bridge. The TS&L considered optimal span length, bridge type, approach length, and constructibility. Drilled shaft abutments at each end were designed to resist the forces exerted by the sliding layer (lateral spreading) of soil. A single-span prestressed girder bridge with lightweight concrete girders was selected for constructibility. This project successfully met at 19% required UDBE goal.
Fun Facts about the Project:
- Structural inspection revealed severe scour under two bridge columns requiring emergency closure.
- Project secured emergency FHWA funding.
- Special lightweight concrete was used in the girders to eliminate intermediate shoring in the steep ravine.
Additional Services Provided by KPFF:
- Bridge Design
- Bridge Inspection
- Utility Infrastructure
- Stormwater Management
- Vehicular Bridge
- Inventory Inspection
Additional Services Provided by Sub-consultants:
- Hydraulic/Channel Design
- Geotechnical Engineering
- Topographic Survey
- Property Acquisition
- Environmental Documentation/Permitting
- Constructibility Evaluation
- Construction Management