Work to restore Inglesham Lock in Gloucestershire begins
A charity is trying to raise £125,000 to restore and open an "iconic gateway" on the Cotswold Canals.
The Inland Waterways Association says Inglesham Lock, off the River Thames at Lechlade, is a crucial part of the canals restoration scheme.
More than 60 volunteers began clearing vegetation towards the restoration on Sunday.
Their work, which will last for three weeks, will also see them start to rebuild the upper wing walls.
A Waterway Recovery Group spokesman said the organisation and its parent body the Inland Waterways Association were keen to open the lock.
"Inglesham Lock is often seen as the gateway to the Cotswold canals restoration, and is an iconic structure," he added.
The ongoing Cotswolds Canals Restoration Project aims to reconnect the River Severn with the River Thames.