It was not until 1795 that Thomas Dadford was appointed as the engineer for the canal itself and construction began in earnest at Penpedairheol near Crickhowell.
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Initially work concentrated on the railways, with John Dadford overseeing the construction of lines from the collieries at Gellifelen to Llangrwyney Forge, and on to the Abergavenny to Brecon turnpike road.
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The Brecon to Pontypool section was one of seven stretches of canal, formally designated as remainder waterways, which were re-classified by the British Waterways Act of 8 February 1983.
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The rock was removed by means of a series of tramroads or tramways which linked north via steep inclines to a wharf on the Monmouthshire and Brecon Canal at Llangattock and south to Brynmawr and the ironworks at Nant-y-glo by two tramroads which contoured the eastern end of the hill.