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

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Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey

3 drawings
22 b&w photos
47 data pages
5 photo caption pages
3 color transparencies

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

CALL NUMBER:
HAER ORE,26-PORT,14-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Measured Drawing(s): 3 (24 x 36 in.)
Photo(s): 22 (4 x 5, 4 x 5 in., and 5 x 7 in.)
Data Page(s): 46 plus cover page
Photo Caption Page(s): 5
Color Transparencies: 3

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

NOTE:
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:
OREGON--Multnomah County--Portland
railroad bridges
vertical lift bridges
vehicular bridges

COLLECTION:
Historic American Engineering Record (Library of Congress)

REPOSITORY:
Library of Congress, Prints and Photograph Division, Washington, D.C. 20540 USA

DIGID:
http://hdl.loc.gov/loc.pnp/hhh.or0291

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.

CONTROL #:
OR0291

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