A 74-year-old man died Thursday evening after a drive shaft and axle broke loose from a vehicle on northbound Interstate 5 and slammed into the vehicle he was riding in near the Nisqually River Bridge. Both drivers involved walked away without injury, and all three people in the two vehicles were wearing seatbelts at the time, though the restraints could not stop the fatal blow from the flying wreckage.
The crash happened shortly before 5 p.m. Thursday just south of the bridge, according to The Olympian. The first vehicle was heading north when its drive shaft and axle came apart, sending a piece of the mechanism into a passenger in a nearby vehicle traveling in an adjacent lane. One vehicle then caught fire and came to rest on the right shoulder south of the river, while the struck vehicle stopped on the left shoulder north of the bridge, according to KIRO 7 News Seattle.
The passenger died at the scene despite lifesaving measures attempted before first responders arrived, The Olympian reported. Washington State Patrol trooper Kameron Watts said no other injuries were known and confirmed that no one was hurt by the flames that engulfed the truck. Watts described the crash as a “catastrophic freak accident,” per the same account.
Explosion Reports Give Way to Mechanical Explanation
Initial reports described a vehicle explosion near milepost 110, but Watts clarified that the incident stemmed from a mechanical mishap rather than a deliberate or explosive event. State patrol also said nothing criminal was suspected in the crash. The KING 5 report also covered the incident.
Washington State Patrol reported that a fatality was involved and that the roadway would remain closed for an unknown amount of time. Northbound I-5 was shut down near milepost 110 and the Nisqually River Bridge, while southbound lanes stayed open with traffic moving slowly, the outlet reported.
Hours of Gridlock Between Lacey and the Bridge
Watts posted around 5:30 p.m. that the freeway was fully blocked near the bridge, and WSDOT Tacoma later posted that northbound I-5 was fully blocked at the Nisqually River Bridge, urging commuters to use alternate routes. Traffic was diverted to exit 114 as the backup grew, extending all the way to Martin Way in Lacey.
Northbound I-5 eventually reopened at the Nisqually River Bridge, but WSDOT Tacoma said the backup would take time to clear even after the lanes came back open. The corridor at the bridge serves as the primary link between Thurston and Pierce counties, according to Thurston Regional Planning Council documents, which helps explain why even a temporary closure there ripples for miles.
A Rare but Not Unprecedented Hazard
Crashes caused by mechanical failure remain uncommon nationally. Mechanical component failure or degradation accounts for roughly 2% of critical reasons assigned in light vehicle crashes, according to the National Highway Traffic Safety Administration's National Motor Vehicle Crash Causation Survey. But when parts do detach at highway speed, the consequences can be severe: a study published in November 2025 by the AAA Foundation for Traffic Safety estimated that road debris, including falling vehicle components, contributed to more than 319,000 crashes, 32,000 injuries and 433 deaths nationwide between 2018 and 2023. Separate research from the foundation found debris-related crashes are roughly four times more likely on interstates than on non-interstate roads, largely because of higher travel speeds.
The Nisqually crash echoes a similar tragedy from April 2024, when a detached tire crossed the median on Interstate 94 in Michigan and struck an oncoming car's windshield, fatally injuring the 49-year-old driver, as previously reported by Hoodline. It also adds to a string of serious highway incidents across Thurston County, which recorded 34 fatal collisions and 166 serious injury crashes between 2019 and 2023.
Open questions remain about whether the flatbed truck was a commercial or personal vehicle, its maintenance history, and whether investigators will examine equipment inspection compliance. The Washington State Patrol Commercial Vehicle Division is authorized under state law to conduct safety audits and compliance reviews on motor carriers operating in Washington, though it is not yet known whether such a review will follow this crash. WSDOT provided real-time updates on the closure and reopening through its online traffic map as crews worked to clear the scene near the bridge.
