Llangollen Canal an Act of Abandonment in 1944, allowing it to close of canals, including much of the Shropshire Union system. However, the line from Hurleston to Llangollen and onwards to Llantisilio was saved, as it was the main supply of water to the rest of the system. On 6 September 1945, due to inadequate maintenance, the canal breached its banks east of Llangollen near Sun Bank Halt. The flow of hundreds of tons of water washed away the embankment of the railway further down the hill, creating a crater which was long and deep. This caused the first traffic of the
Llangollen Canal as the branch was constructed. At Frankton Junction the Montgomery Canal, which is partially restored, heads southwards. For historic reasons the bridge numbering continues down the Montgomery Canal and a second bridge numbering series for the Llangollen Canal begins with Rowson's Bridge (which is numbered both 1W and 70). The "W" addition was part of a Mimimum Safety Standards scheme instigated by British Waterways, to avoid possible confusion, especially for emergency services, of having different bridges on the same canal with the same number. British Waterways consulted with the Inland Waterways Association and the Shropshire Union Canal Society before finally