Category: Monthly Webinar Washington State’s Skagit River Bridge Emergency Slide

October 24, 2013 1:00 pm

by Bijan Khalegh Ph.D., P.E., S.E., State Bridge Design Engineer, Bridge and Structures Office, Washington State DOT.

Webinar Documents

On May 23, 2013, one span of the Skagit River Bridge on Interstate 5 (I-5) in Burlington, Washington was struck by an over-height vehicle, and a portion of the truss bridge collapsed into the river. The WSDOT recovery plan to reconstruct the Skagit River Bridge includes three contracts: 1) install a temporary bridge to reconnect I-5, 2) replace the permanent span using ABC techniques, and 3) rehabilitate the remaining trusses to the current functionality standards. This presentation focused on the second contract, the ABC replacement. The replacement span is composed of deck bulb tee girders made of lightweight aggregate. It was built adjacent to the temporary bridge. On Saturday night, September 14, 2013 the roadway was closed to traffic for a period of 19 hours while the temporary span was laterally slid out and the permanent span was laterally slid into its final position. The technical details of the move was discussed.