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Steel Bridge, Spanning Willamette River at State Route 99, Portland, Multnomah County, OR
Summary
Significance: An early example of the Waddell-type vertical lift bridge, the Steel Bridge documents that, guided by Harrington, most features of the type achieved "standard" form by 1912. It also demonstrates Waddell & Harrington's virtuosity in developing the bridge type's rich potential: its lower, railroad deck may be lifted independently, telescoping into the trusses above, or both decks may be lifted together, a unique combination. Combined with its great weight and massive members, these features made it an essential case in subsequent engineering discussions.
Unprocessed Field note material exists for this structure: FN-8
Unprocessed Field note material exists for this structure: N871
Survey number: HAER OR-21
Building/structure dates: 1910-1912 Initial Construction
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