The B4558 road is a road in

Powys Powys (; ) is a Local government in Wales#Principal areas, county and Preserved counties of Wales, preserved county in Wales. It is named after the Kingdom of Powys which was a Welsh succession of states, successor state, petty kingdom and princi ...

, central Wales, with a total length of . It begins at a junction with the A4077 road across the Usk bridge from

Crickhowell Crickhowell (; cy, Crucywel , non-standard spelling ') is a town and community in southeastern Powys, Wales, near Abergavenny, and is in the historic county of Brecknockshire. Location The town lies on the River Usk, on the southern edge ...

and runs northwest up the southern side of the Usk valley to a junction with the

A40 road A4 most often refers to: *A4 paper, a paper size defined by the ISO 216 standard, measuring 210 × 297 mm A4 and variants may also refer to: Science and mathematics * British NVC community A4 (''Hydrocharis morsus-ranae - Stratiotes aloide ...

3.5 km east of

Brecon Brecon (; cy, Aberhonddu; ), archaically known as Brecknock, is a market town in Powys, mid Wales. In 1841, it had a population of 5,701. The population in 2001 was 7,901, increasing to 8,250 at the 2011 census. Historically it was the coun ...

. En route from Crickhowell it passes through the villages of

Llangynidr Llangynidr is a village, community and electoral ward in Powys, Wales, about west of Crickhowell and south-east of Brecon. The River Usk flows through the village as does the Monmouthshire and Brecon Canal. It is in the historic county of B ...

Talybont-on-Usk Talybont-on-Usk ( cy, Tal-y-bont ar Wysg) is a village and community in Powys, Wales, in the historic county of Brecknockshire. It lies on both the Caerfanell river and the Monmouthshire and Brecon Canal, about from the River Usk. In 2001 ...

, and Pencelli. It is closely followed over this section by the

Monmouthshire and Brecon Canal The Monmouthshire and Brecon Canal ( cy, Camlas Sir Fynwy a Brycheiniog) is a small network of canals in South Wales. For most of its currently (2018) navigable length it runs through the Brecon Beacons National parks of England and Wales, Na ...

which it crosses six times. River crossings include those of the Nant Cleisfer and Afon Crawnon at Llangynidr, the Caerfanell at Talybont and the

Nant Menasgin The Nant Menasgin is a short river in Powys, Wales whose headwaters rise in Cwm Oergwm, beneath Fan y Bîg, in the central Brecon Beacons, and flow northeastwards via Llanfrynach, to join the River Usk at Pencelli. The stream in Cwm Oergwm is jo ...

between Pencelli and

Llanfrynach Llanfrynach is a village and community in the county of Powys, Wales, and the historic county of Brecknockshire. The population of the community as taken at the 2011 census was 571. It lies just to the southeast of Brecon in the Brecon Beacons N ...

. It crosses the Usk itself by the historic Lock Bridge just south of the village of Groesffordd, east of Brecon.

References

{{DEFAULTSORT:4-4558 Roads in Wales Transport in Powys