Abercarn Aqueduct and bridge (partly in Crosskeys Community)

The aqueduct and bridge carry both the canal and adjacent road across the Carn valley. The structure comprises a high abutment to W with a relatively small tunnel for the stream; to S is a further extension of the abutment in different later masonry, both sections rising to form a low parapet beside the W side of the canal; on the E side, also of the later period masonry, is the E tunnel portal, the surrounding masonry not continuous with the higher roadside parapet. The aqueduct masonry to W is mostly narrow coursed rubble creating a massive retaining wall with ashlar voussoirs and tooled quoins. Segmental arched portal; on either side the walls project slightly leaving the central section including arch recessed. Walls curve outwards, with a sharper curve end left (N). Right end (S) returns sharply with a change in masonry to rockfaced stone. The parapets at canal level also differ though are mostly ivy covered. On E side the portal is round arched with deep narrow rockfaced voussoirs; angled abutments with heavy capstone, incomplete to left, are built against the archway, the masonry bonded at impost level. Above is the roadside parapet of rubble with rockfaced coping and boundary stone 'Mynyddislwyn Highway District MR 1880'.