A 20th century beam bridge carrying the former railway NPRN 267324, now a trackway, over the Grwyne Fawr river. The buttresses have a stone core with concrete shuttering covering it. This is now starting to erode. Flat concrete slabs laid on steel girders carry the track bed. The bridge was built in 1927 when the railway, built to bring materials and men to the reservoir site, was modified. J.J.Hall, Trysor, 27 September 2007