The I-5: Interstate Bridge serves as a critical connection point between Oregon and Washington . Transporting an estimated 150,000 travelers per day over the Columbia River, an essential marine route, this historic bridge has the ability to lift and lower to allow large shipping vessels to pass under the bridge. The century-old trunnion shafts, sheaves, bearing assemblies, and counterweight cables in the south tower of the northbound bridge were in need of replacement to maintain the lift span function.
GRI provided Hazardous Materials and Environmental engineering services to help Oregon Department of Transportation (ODOT) and Washington Department of Transportation (WSDOT) discover hazardous materials at the site ahead of the shaft replacement. Our project team provided asbestos, lead based paint, mercury, polychlorinated biphenyls, and treated timber surveys along the bridge. The information that we discovered through our surveys was provided to the design and construction team to aid in the shaft replacement.