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Portland

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Steel Bridge, Spanning Willamette River at State Route 99, Portland, Multnomah County, OR



B&W Photos

HB996600
General View From Northwest

HB996601
General View From Broadway Bridge To The North

HB996602
General View From Broadway Bridge To The North

HB996603
Detail, Central Span In Raised Position

HB996604
Detail, Pulleys And Shin Wheels For Lower Deck

HB996605
Detail, Center Span Drive Gears

HB996606
View Of Lift Span Interior

HB996607
Western Portal From Railroad Level


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Item Title


Location
Spanning Willamette River at State Route 99, Portland, OR

Find maps of Portland, OR


Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER OR-21
Unprocessed field note material exists for this structure (FN-8, N871; FN-8; N871).
Building/structure dates: 1910 initial construction
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.

Subjects
Railroad Bridges
Vertical Lift Bridges
Vehicular Bridges


Related Names
Waddell & Harrington
American Bridge Company
Robert Wakefield & Company
Union Bridge & Construction Company
Oregon-Washington Railroad & Navigation Company
Union Pacific & Southern Pacific
McGaw, Judith A., Historian
Norman, James, Photographer
Schwab, Leslie, Photographer


Collection
Historic American Engineering Record (Library of Congress)

Contents
Photograph caption(s): 
1. General view from northwest
2. General view from Broadway Bridge to the north
3. General view from Broadway Bridge to the north
4. Detail, central span in raised position
5. Detail, pulleys and shin wheels for lower deck
6. Detail, center span drive gears
7. View of lift span interior
8. Western portal from railroad level
GENERAL VIEW FROM BROADWAY BRIDGE TO THE NORTH.


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