 In 1404 the Abbot of Reading Abbey, who had control of the River Kennet, made an agreement with the town's guild to allow craft to pass through the lock between sunrise and sunset on payment of a one penny toll.By 1794, not much had changed, with John Rennie, the engineer of the Kennet and Avon Canal describing it as "a very bad and inconvenient staunch lock".The lock was converted to a timber-constructed pound lock in 1802 to improve navigation from the Thames into the River Kennet enabling boats to travel all the way to the Bristol area.