This navigation is still used by pleasure boats, notably by the members of the Carrick-on-Suir Boat Club, but its once-busy commercial traffic has largely ceased; the final nail will be hammered in when the new Waterford bypass road-bridge crosses the Suir and prevents tankers from supplying Morris Oil at Fiddown. This account includes some historical material and photos taken on a trip downriver aboard the barge 31B.
I’m referring to it as the middle Suir as there was a horse-drawn navigation upstream from Carrick to Clonmel and of course ships can come up to Waterford from the sea (as well as more interesting vessels from the Nore and the Barrow).
Irish waterways history 