U.S. 101 Simpson Avenue Bridge

U.S. 101 Simpson Avenue Bridge (Hoquiam, WA)

Type:  Double Leaf Strauss Underneath Counterweight Bascule
Location: Hoquiam, WA
Client: Washington State Department of Transportation


Stafford Bandlow Engineering personnel provided construction engineering and inspection (CEI) services for the rehabilitation of a double leaf bascule bridge.  The rehabilitation included complete replacement of all electrical systems, construction of a new operator’s house, and replacement of the majority of mechanical machinery including all racks, main pinions and main pinion bearings for the span drive machinery, complete rehabilitation/replacement of the jaw type center lock machinery, and replacement of the counterweight trunnions and bushings.  SBE’s responsibilities included coordination of a team of mechanical and electrical engineers and inspectors to provide complete shop and field inspection of all mechanical/electrical aspects of the rehabilitation project.  SBE performed strain gage balance testing throughout the project to ensure that balance was maintained within permissible limits, reviewed contractor’s procedures and plans for feasibility and/or conformance to design specifications, performed shop inspection of machinery, and inspection of field work to install, align and start up the rehabilitated machinery.  The team of mechanical/electrical inspectors provided 24/7 coverage throughout a critical ten-week bridge closure to ensure close coordination of all field and shop issues to avoid delays.  The bridge was re-opened to marine and vehicular traffic on schedule at the end of the closure period.