Hawthorne Bridge, Spanning Willamette River at Hawthorne Boulevard &, Portland, Multnomah County, OR

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

28 b&w photos
69 data pages
4 photo caption pages
3 color transparencies

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TITLE:
Hawthorne Bridge, Spanning Willamette River at Hawthorne Boulevard &, Portland, Multnomah County, OR

CALL NUMBER:
HAER ORE,26-PORT,10-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Photo(s): 28 (4 x 5, 4 x 5 in., and 5 x 7 in.)
Data Page(s): 68 plus cover page
Photo Caption Page(s): 4
Color Transparencies: 3

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

NOTE:
Survey number HAER OR-20

Unprocessed field note material exists for this structure (FN-7; N870).

Building/structure dates: 1909 initial construction

Significance: The Hawthorne Bridge is the oldest extant vertical lift bridge in the United States. It is the oldest of Portland's Willamette bridges, initiating the replacement of earlier swing spans. Designed by Waddell & Harrington, as the firm's earliest surviving lift bridge it reveals how Harrington managed the transition from Waddell's South Halsted Street prototype to the "standard" vertical lift form. Reconfiguration of its approaches, replacement of its wooden deck by steel, and other modifications embody 90 years of highway engineering history.

SUBJECTS:
OREGON--Multnomah County--Portland
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.or0290

CONTENTS:
Photograph caption(s):
1. South elevation
2. Perspective view from southwest
3. Perspective view from northwest
4. View of central span from south
5. West portal elevation
6. Perspective view from southwest showing central span
7. View of lift span from deck
8. Detail, cable connection to lift span
9. View from top of east tower
10. View from top of east tower
11. Engine room and reduction gears atop central span
12. Operator in control room

CONTROL #:
OR0290

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