The Hawthorne bridge will be closed to cars only on Sunday from 6 a.m. until as late as 6 p.m. for maintenance work, according to Multnomah County.
Crews will repair joints between deck sections, inspect electrical cables, and repair siding above traffic lanes during the closure.
Sidewalks on the bridge will remain open for bicyclists and pedestrians including participants in the National Alliance for Mental Illness walkathon.
The work will not affect river traffic that requires a drawbridge.
TriMet bus routes that normally use Hawthorne bridge will detour to Morrison bridge and Ross Island bridge while Hawthorne is closed.
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