Once a busy and important river port the last industrial building on the riverside in Sudbury has been converted into the town's Quay Theatre. The River Stour Trust, formed in 1968, has its headquarters in Sudbury, and a purpose built visitor centre located at Cornard Lock. The trust operates electric-powered boats from the Granary in Quay Lane, to Great Henny, a few miles downstream. Each September, the stretch of the River Stour hosts hundreds of canoe and small boat enthusiasts in a weekend event called "Sudbury to the Sea", which finishes at Cattawade.