Burlington Northern Railroad Bridge, Spanning Willamette River at River Mile 6.9, Portland, Multnomah County, OR

Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one of the major works of renowned bridge engineer, Ralph Modjeski. Unprocessed Field note material exists for this structure: FN-2 Survey number: HAER OR-7 Building/structure dates: 1906- 1908 Initial Construction Building/structure dates: 1954 Subsequent Work Building/structure dates: 1957-1959 Subsequent Work Building/structure dates: 1963 Subsequent Work Building/structure dates: 1979 Demolished Building/structure dates: 1985-1988 Subsequent Work