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Troopers say a semi-truck rolled over on Interstate 5 south of Mount Vernon after the driver fell asleep at the wheel.

It happened around 3 a.m. at milepost 216, which is just south of Starbird Road. That s about 13 miles south of the current detours in Mount Vernon for the Skagit River bridge collapse.

A Washington State Patrol spokesman said the FedEx semi was the only vehicle involved and the driver has minor injuries. The driver allegedly fell asleep and traveled off the freeway. When he tried to get back on the road, he lost control and rolled the trailer on its side.

The trailer was partially loaded.

Two lanes were blocked for about two and a half hours before the truck was righted. The accident scene was cleared by 7 a.m.

This is the third semi crash on a major Washington state highway in the last two weeks.

Another FedEx truck jackknifed and crashed May 29 on I-5 in downtown Seattle. Troopers said the driver was going too fast for the wet conditions and crashed after seeing brake lights in front of him.

A semi rolled over on I-405 in Renton on June 4. Trooper said the driver was distracted. OnJune 7, another semi rolled over on Interstate 90 at Snoqualmie Summit, blocking traffic for several hours.

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