Peter Western Bridge Replacement
The Peter Western Bridge carries South 116th Street over a steep ravine and creek bed that conveys storm water in Burien, Washington. Over time, the bridge foundations in the creek were undermined by severe erosion and the bridge was demolished in 2017.
Located approximately 40 feet above the creek, the new bridge consists of six 175-foot-long, lightweight precast girders with a cast-in-place deck. The bridge is founded on two pier caps with 55-foot shafts. Creek restoration included a structural earth wall to retain the ravine slope, new trees, and landscaping.
Due to the restricted access and narrow roadway work zones, the Peter Western Bridge took constant collaboration and teamwork between all parties to successfully coordinate the complex stages of construction. Even though the project was difficult to build it was faced with obstacles where the team had to react quickly and work together in order to push forward with completion. For instance, as the bridge was coming to completion, heavy rains and loose soils caused severe slope failures that threatened the structural integrity of the new bridge as well as the ability to finish the project on time to meet strict in-water work requirements.
Through collaboration and teamwork, Hamilton and the City of Burien were able to react quickly to come up with solutions and execute the work on an accelerated schedule.
Major Project Elements