The River Usk rises at Fan Brycheiniog [Map] after which it flows broadly east through Sennybridge [Map], Brecon [Map], then south-east, under Crickhowell Bridge, Monmouthshire [Map], Abergavenny, Monmouthshire [Map], then under the Chain Bridge [Map] at Kemeys Commander, south through Usk, Monmouthshire [Map], under the bridge at Newbridge-on-Usk [Map], past Caerleon [Map] to Newport, Monmouthshire [Map] where it joins the Severn Estuary.

1538. Crickhowell Bridge, Monmouthshire [Map] is a bridge over the River Usk first constructed in 1538. In 1706 it was completely rebuilt in stone with additional arches, at a cost of £400. The bridge is claimed to be the longest stone bridge in Wales at over 128 metres.

In 1829 the Chain Bridge [Map] over the River Usk at Kemeys Commander was built by Brown Lenox of Pontypridd.

Between 1905 and 1906 by George Palmer of Neath, is an iron arch with green-painted girders which is still referred to as Chain Bridge.

Newbridge-on-Usk [Map] is the location of a red sandstone three-arched bridge over the River Usk built in 1779 at the Normal Tidal Limit of the River.