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

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.
Unprocessed Field note material exists for this structure: FN-7
Unprocessed Field note material exists for this structure: N870
Survey number: HAER OR-20
Building/structure dates: 1909-1910 Initial Construction