Overturned Costco big rig blocks traffic on I-580 in Dublin

Costco truck overturned on Interstate-580 in Dublin. 

A Costco big rig overturned and blocked traffic in the westbound lanes of Interstate 580 in Dublin Friday morning, according to the California Highway Patrol. 

One lane remains closed this evening and the truck remains on its side. The overturned truck is causing a major traffic backup. 

The crash was reported just east of the Interstate 680 interchange just after 9 a.m. Injuries were reported after the overturned tractor-trailer truck crashed. 

There is no estimated time to reopen the lane. The cause of the crash is under investigation.