The Ross Island Bridge crosses the Willamette River and is a major southwest – southeast route for the Portland metropolitan area. The east approach of the bridge crosses over Oregon Route 99E, a high-speed arterial. The bridge approach also passes over a live railroad line on the Martin Luther King Jr. and Grand Avenue Viaducts. This project was the first phase of a larger project involving replacement of the two viaduct structures that cross over Division Street and the Union Pacific Railroad right-of-way near the Oregon Museum of Science and Industry on the banks of the Willamette River.
The project included installation of 6,175 feet of new 3- to 36-inch PVC, reinforced concrete, and HDPE pipelines for potable water, storm sewer and sanitary sewer in an older industrial area of east Portland, through contaminated soils and wood waste. The contract stipulated that flows would continue during construction and JWF designed a detailed sanitary diversion flow plan to ensure no interruption in service to local residents. The project also required pipe ramming of 265 feet of 36-inch steel casing with ductile iron liner pipe under active Union Pacific and Oregon Pacific Railroad lines. JWF performed cold-plane pavement removal, constructed new hot mix asphalt concrete (HMAC) and Portland composite cement (PCC) surfaces, curbs, walks, driveways and other such structures. In addition, we installed new traffic control, guidance and illumination devices. A cathodic protection system was installed to mitigate the effects of corrosion on external surfaces of the buried pipe.