A lorry has collided with Broughton Crossing Bridge this lunchtime.
A collision has caused a busy road to close on the edge of Aylesbury.
Broughton Lane is shut while Transport for Bucks deals with the incident on the bridge, which crosses the canal.
Transport for Bucks said: "
Transport for Buckinghamshire received a call today, Thursday 30th March, from the Canals and River Trust who are responsible for the maintenance of Broughton Lane bridge, requesting an emergency road closure after a vehicle hit the bridge.
"TfB have closed the road at the old Stocklake junction and the entrance to the canal car park and set up a diversion route through Aylesbury.
"Alternative routes for local drivers are Tring Road, Oakfield Road, Douglas Road, Bierton Road, Aylesbury Road, Burcott Lane, and Stocklake. TfB has halted several nearby, planned roadworks to help ease congestion while the road is closed and the diversion is in place.
"The vehicle has been removed from site but the road closure will remain in place while the Canals and River Trust carry out a survey of the damage, and determine any repairs that need to be done. The bridge will remain closed for a month, initially, and possibly longer if the repairs required are extensive. Timescales will be clearer when the survey is complete.