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



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Item Title


Location
Spans Willamette River at US Highway 30, Portland, OR

Find maps of Portland, OR


Created/Published
Documentation compiled after 1968.

Notes
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
Suspension Bridges
Vehicular Bridges


Related Names
Robinson & Steinman
Wallace Bridge & Structural Steel Company
Gilpin Construction Company
John A. Roebling's Sons Company
Lindstrom & Feigenson
La Pointe Construction Company
Norman, James, Photographer
Schwab, Leslie, Photographer


Collection
Historic American Engineering Record (Library of Congress)

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


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