PORTLAND, Ore. – A driver on the Ross Island Bridge crashed a pickup truck through a guardrail on the west end and landed on Southwest Naito Parkway Friday afternoon.

The truck landed on its top.

Portland police said the driver's injuries were serious, but not life-threatening.

Witnesses told police the pickup was westbound on the Ross Island Bridge at around 12:45 p.m. when it crashed through the guardrail. It's unclear what caused the crash.

Police briefly closed the eastbound lanes of the Ross Island Bridge at Naito Parkway, and the ramp from Naito Parkway to the bridge. The ramped reopened during the Friday evening commute.