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5 A.M. update:

The Rio Vista bridge is again operational.

Original Story

A malfunction on the Rio Vista Bridge over the Sacramento River in Solano County is causing a major traffic snag for drivers.

Caltrans says some kind of mechanical issue led the bridge to become stuck in the “up” position, making it impossible to cross for drivers.

RELATED STORY: Fast Facts abut the Rio Vista Bridge

According to Caltrans, the bridge was raised to let a ship in around 3:30 p.m. and then would not lower. A spokesperson tells ABC10 that repair crews are aiming to reopen the bridge by 3:30 a.m. Friday, but for now the bridge will remain closed indefinitely.

Drivers are being asked to seek alternate routes. There are two free ferries to shuttle people; one off of State Highway 84 and one off of State Highway 220.

Here's an inside look at the bridge from CalTrans: