The very last stretch of towpath between Lechlade and the Round House near Inglesham has been closed for urgent repair work.
The problem is confined to where the path leaves Wiltshire for Gloucestershire but the only alternative is through the town.
The diversion is across Halfpenny Bridge and ahead up Thames Street to the High Street. Turn left to pass a handy teashop and where the houses end go left down a signposted track which runs south past Willow Tree Farm. At the end is the confluence with the River Colne and the last bridge over the navigable Thames.
The towpath is expected to reopen by Saturday 4 April just before the Easter holidays.
See pages 195 & 196.