Sixteen Inches from Disaster: How Skagit's Span Suddenly Fell
Sixteen inches was the difference between safe passage and sudden collapse when a permitted oversize load struck the Skagit River bridge on the evening of May 23, 2013 - a fracture-critical span built in 1955, struck repeatedly over decades, and carrying 71,000 vehicles a day. How did routine inspections, a noted three-inch gash, and a pilot car on a cellphone all align to make a bridge fail in seconds?
In this episode, we walk through the sequence of events, the design limits of a through-truss bridge, and the human and regulatory gaps that left an inner lane with 17 feet of clearance unused. Could a single missed radio call and two extra inches on a truck be enough to topple a span?
Person: Professor Charles Roeder Date: May 23, 2013 Location: Interstate 5 between Mount Vernon and Burlington, Washington Event: Bridge span collapse into the Skagit River Traffic: 71,000 vehicles per day
- Bridge originally built in 1955 and classified as a fracture-critical through-truss design. - Clearance: outer lanes 14 feet 7 inches, inner lanes approximately 17 feet. - Permitted load height: 15 feet 9 inches; measured actual load height: 15 feet 11 inches (2 inches over permit). - Recorded damage history: impacts documented back to 1979, including a three-inch gash noted after an October 22, 2012 strike. - Three people entered the river on the night of the collapse and all three were rescued alive.
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