Authorities in the Salem, Ore. area report the driver didn't notice signs on I-5 warning of a low bridge.
Deputies say the driver's rig was 14 feet tall, but the railroad trestle was only 11 feet high.
The man told deputies he was too busy watching his GPS.
The bridge wasn't damaged, but it took two hours to free the stuck truck.
The driver has been cited for failure to obey a traffic control device.