Embankment & Aqueduct of Brecknock & Abergavenny Canal inc. N Revetment Walls and SW Overflow Bridge

The Brecknock and Abergavenny Canal's embankment and aqueduct, which includes the northern revetment walls and the southwest overflow bridge, is a significant structure built in the 19th century. The massive earth embankment rises approximately 25 metres high and extends about 100 metres long, effectively blocking the lower mouth of the Clydach Gorge. The Clydach River flows through a long tunnel that measures around 90 metres in length, featuring arched buttressed portals made of ashlar voussoirs and rubble abutments.

Above this tunnel, to the north, there is a former tramroad tunnel that now serves as a pedestrian route. This round-arched tunnel has stone voussoirs at its portals and a segmental over-arch on the west side. To the northwest, a very long rubble revetment wall contains an earth bank and follows the line of the track leading to Waterfall Cottages. To the northeast of the tramroad tunnel, there are sloping splayed revetments. Finally, to the southwest, there is a small segmentally-arched bridge that crosses over the overflow, featuring stone voussoirs and a rubble-capped parapet.