Bridges and Structures

Hawthorne Bridge Rehabilitation

DEA provided multi-discipline design engineering and construction engineering assistance for a $22 million rehabilitation of the historic Hawthorne Bridge in downtown Portland. The historic structure was built in 1910 and is the oldest operating vertical-lift span bridge in the United States.

The project included the evaluation of the existing structure and machinery, total replacement of the deck and its supporting structure, widening the bridge on each side to accommodate wider sidewalks, modifications to the approaches to improve accessibility, total repainting, including removal of all lead-based paint, and rehabilitation of the lift span.

Public outreach programs supported full closure of the bridge for one year. DEA developed all traffic mitigation and signing plans for the construction phase, including a plan to reroute more than 20,000 autos, 2,000 bicyclists and 2,000 pedestrians daily.

Project Awards

  • 1998 Oregon Transportation Quality Initiative Award for Interagency Partnering, FHWA
  • 1999 Project of the Year, Women's Transportation Seminar, Portland Chapter
  • 2000 Grand Award, CECO
  • 2000 Grand Award, SAME, Portland Chapter
  • 2000 National Finalist, Engineering Excellence Awards, ACEC