The toll lodge on Cleveland Bridge in Bath is significantly damaged after an accident early this morning.
The A36 Bathwick Street is closed in both directions.
Authorities say a single vehicle was involved and it collided with several bollards and a nearby building.
Bath & North East Somerset Council say highways engineers hope to reopen one lane over the bridge with temporary traffic signals at lunchtime.
These are expected to remain in place throughout this evenings rush hour.
Traffic is very heavy and drivers are advised to the avoid this route.
The council say that despite the incident the bridge is still structurally sound.