Aqueduct carrying Montgomeryshire Canal over River Vyrnwy

The structure is an aqueduct that carries the Montgomeryshire Canal over the River Vyrnwy. It is a long five-arch masonry construction made of squared blocks, featuring capping bands and rusticated segmental arch rings with keystones and rusticated soffits. The aqueduct has V-shaped stepped cutwaters with an almond profile and domed cappings. There are lines of oval brace-plates for tie-rods through the haunches of the arches. The central arch and the outer north arch are supported by cradles of fish-bellied cast iron girders, which have tie-rods through the haunches and exposed rods beneath the soffits. The outer masonry ends are checked forward with curving abutments that descend to end at square piers near the river banks.

On the towpath side of the aqueduct, there are three tapering stone piers with cappings, and an ironwork handrail is set in stone seatings. The canal is contained by large masonry edges and puddled clay along its narrow length.