Police officers were called to Wearmouth Bridge after a man was spotted on the wrong side of the railings.
The bridge was closed to pedestrians as they dealt with the incident.
However, a short time later the man climbed back over the railings to safety.
A spokeswoman for Northumbria Police said: "The man is now safely down from the railings."
The man was first seen on the wrong side of the railings at 10.35am.