B4518 road

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Route information
Length30.5 mi (49.1 km)
Major junctions
Southeast endRhayader
 A470 road
Northwest endLlanbrynmair
Road network

The B4518 road is a road in Powys, central Wales, with a total length of 30.5 miles (49.1 km). It begins at 52°18′5″N 3°30′41″W / 52.30139°N 3.51139°W / 52.30139; -3.51139 in Rhayader near the junction of the A470 road and the A44 road and leads eventually to the A470 again at Llanbrynmair at 52°36′42″N 3°37′38″W / 52.61167°N 3.62722°W / 52.61167; -3.62722. En route going north from Rhayader it passes through the following settlements: St Harmon, Pant-y-Dwr, Tylwch, Llanidloes (where it crosses the A470 again), Staylittle, Pont Crugnant, Pennant, Bont Dolgadfan, Llan and Plas Esgair.[1] It passes through the Clywedog Valley and Clywedog Reservoir, built in 1964.[2]


  1. ^ Google Maps (Map). Google.
  2. ^ Beazley, Elisabeth; Howell, Peter (1975). The companion guide to North Wales. Collins. pp. 304–13. ISBN 978-0-00-211199-7.