St. John's Bridge, Spans Willamette River at US Highway 30, Portland, Multnomah County, OR

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

3 drawings
31 b&w photos
29 data pages
3 photo caption pages
2 color transparencies

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TITLE:
St. John's Bridge, Spans Willamette River at US Highway 30, Portland, Multnomah County, OR

CALL NUMBER:
HAER ORE,26-PORT,13-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Measured Drawing(s): 3 (24 x 36 in.)
Photo(s): 31 (4 x 5 and 5 x 7 in.)
Data Page(s): 28 plus cover page
Photo Caption Page(s): 3
Color Transparencies: 2

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

NOTE:
Survey number HAER OR-40

Unprocessed field note material exists for this structure (FN-24; N874).

Building/structure dates: 1929 initial construction

Significance: The St. John's Bridge is significant for its design and for its representation among suspension bridges in the Trans-Mississippi West and in Oregon. At the time of its completion, the bridge had the longest span of any suspension bridge west of Detroit. New engineering features introduced in the bridge included the world's tallest steel frame piers of reinforced concrete, constructed in distinctive Gothic arch motif, the first use of lofty steel towers lacking conventional diagonal bracing; incorporation of the longest prestressed steel cable rope strands yet designed; and the first use of reinforced concrete pedestal piles for an anchorage foundation.

SUBJECTS:
OREGON--Multnomah County--Portland
suspension 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.or0307

CONTENTS:
Photograph caption(s):
1. Perspective view from southwest
2. Below-deck view from west bank
3. Perspective view of west tower from southwest
4. Western portal from approach road
5. Concrete base to eastern tower
6. Suspender cable connection to top chord of deck truss, looking west
7. Center span cable connection with new cable saddles
8. Bridge plate, west tower
9. Concrete approach towers from east bank
10. Detail, anchorage at northeast abutment
11. Detail, prestressed cables, northeast anchorage
12. Anchorage detail
13. Anchorage detail

CONTROL #:
OR0307

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