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Morrison Bridge, Spanning Willamette River on Morrison & Alder Stre, Portland, Multnomah County, OR



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B&W Photos


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Item Title


Location
Spanning Willamette River on Morrison & Alder Stre, Portland, OR

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Created/Published
Documentation compiled after 1968.

Notes
Survey number HAER OR-100
Building/structure dates: 1954 initial construction
Significance: The Morrison Bridge embodies the mid-twentieth century transition in bridge engineering. The last bascule bridge built on the Willamette in Portland, it replaced the last of the earlier swing spans to carry vehicular traffic. The Morrison had been on the drawing board since 1927; thirty years later it essentially embodied the 1920s consensus. But it was also the first local Willamette span to emerge from corporate design rather than from a small consulting firm led by a nationally prominent individual engineer. Innovative open bascule piers permit the river to flow through, minimizing the hydraulic effects of their exceptional size. It is the only non-freeway bridge integrated with Portland's freeway system.

Subjects
Bascule Bridges
Vehicular Bridges


Related Names
Sverdrup & Parcel
Moffatt, Nichol & Taylor
American Bridge Division
U.S. Steel
Manson Construction & Engineering
McGaw, Judith A., Historian
Norman, James, Photographer
Schwab, Leslie, Photographer


Collection
Historic American Engineering Record (Library of Congress)

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