 Excavation of this feature in 2006, constructed on a natural high point in the harbour, put its date in the Roman to medieval range but found no evidence to be more specific.The Canal Company funded a replacement wooden road bridge served by a toll-house situated at the northern end.There was a weight-limit and after WW2 only single-decker buses were allowed across and if they were carrying too many passengers some had to get out and walk, regardless of the weather, to reduce axle-weight.