Footbridge at hydro-electric station (partly in Llanwrthwl community)

The footbridge at the hydro-electric station, which is partly located in the Llanwrthwl community, is a Grade II listed structure. It connects two symmetrical power stations that are built from brown stone and topped with slate roofs, positioned parallel to the River Elan. Each power station features a four-window block attached to a lower three-window block that is oriented towards the river. Each larger block has a central doorway facing the river, with a small window above it, and two windows on each side featuring cruciform glazing. The rear elevation is similar but does not have a doorway. The gable end facing the dam includes a doorway with an elliptical head and a round window above it. The lower block is set forward and has a doorway in the angle, with three windows: a central two-light window flanked by two three-light windows. The rear of the lower block is similar but features a central doorway instead of a window. The gable end away from the dam has a large three-light round-headed window with a heavy transom.

Inside, the power stations retain their operating machinery, including turbines and generators in the upstream blocks, while the downstream blocks contain railed pits and wooden cases with gauges.

The footbridge itself is constructed of stone and features three broad elliptical arches. It has return walls at the ends opposite the entrances to the power houses and connects with revetment walls below the power houses, which are made of grey stone and have splayed downstream ends with arched outlets.