A closed footbridge, half a mile from Staines, is now expected to remain out of use until 2027.
Bridge 142, still bearing its Thames Conservancy livery paint, carries the towpath over to one side of a hardly discernible island shortly before the M25 and Bell Weir Lock.
During 2023 the cast iron crossing was hit by a tree and in February last year it was closed after an inspection detected cracks.
A diversion was immediately put in place and at first expected to last for just six months.
Suddenly this November there has been some progress with an environmental survey and a further inspection by ground investigation specialists to decide the bridge replacement specification.
The diversion begins at a warning notice placed a quarter of a mile before Bridge 142 for those walking upstream.
The alternative is urban and quickly highlights how the Thames is a successful and vital green corridor isolating the walker from nearby noise and pollution.
DIVERSION: Turn inland, by a boat turned flower bed, down River Park Avenue. At the main road, called The Causeway, go right.
After passing under the M25 motorway, the pavement comes to an end at a crossing.
Cross over as indicated by the traffic/pedestrian lights.
Go right for a short distance to find path starting on the left. Follow this winding wooded path to the towpath and turn left.
Bell Weir Lock is ahead.
