NTSB Press Release

National Transportation Safety Board
Office of Public Affairs

NTSB Issues an Investigative Update on the Interstate 5 Bridge Collapse in Washington

May 28

The National Transportation Safety Board today released an update on its investigation into the May 23 bridge collapse in Mount Vernon, Washington. A 160-foot span of the four-lane Interstate 5 bridge collapsed into the Skagit River.

Witnesses reported that just prior to the collapse, a truck tractor in combination with an oversized semitrailer, traveling southbound on I-5, struck the overhead truss superstructure.

NTSB investigators have been on scene since the night the bridge collapsed and are continuing to coordinate activities with the Washington Department of Transportation.

This is an informational release only. No interviews are being conducted.

Further investigative updates will be issued as events warrant. To be alerted to any updates or developments, please follow the NTSB on Twitter at twitter.com/ntsb.

Office of Public Affairs
490 L'Enfant Plaza, SW
Washington, DC 20594
(202) 314-6100
Terry Williams



The National Transportation Safety Board (NTSB) is an independent federal agency charged with determining the probable cause
of transportation accidents, promoting transportation safety, and assisting victims of transportation accidents and their families.