Built by Thomas Telford, 1795 – 1805 there are 18 piers of local stone, the central ones over the Dee being 126′ high up to the ironwork.

The canal runs through the iron trough, 1007′ long, 11′ 10” wide and 5′ 3” deep, the largest in Britain. The iron was supplied by William Hazeldine form his foundaries at Shrewsbury and nearby Cefn Mawr.

Total cost £47,000

Water is fed from the Dee at the Horseshoe Falls at Llantysilio near Llangollen.