The M4 motorway Usk bridge, officially St. Julians Bridge, carries the

M4 motorway The M4, originally the London-South Wales Motorway, is a motorway in the United Kingdom running from west London to southwest Wales. The English section to the Severn Bridge was constructed between 1961 and 1971; the Welsh element was largely ...

across the

River Usk The River Usk (; cy, Afon Wysg) rises on the northern slopes of the Black Mountain (''y Mynydd Du''), Wales, in the westernmost part of the Brecon Beacons National Park. Initially forming the boundary between Carmarthenshire and Powys, it ...

in the city of

Newport, Wales Newport ( cy, Casnewydd; ) is a city and county borough in Wales, situated on the River Usk close to its confluence with the Severn Estuary, northeast of Cardiff. With a population of 145,700 at the 2011 census, Newport is the third-larges ...

. The bridge comprises two separate structures, for the eastbound and westbound carriageways. When travelling westbound, the bridges lead directly into the twin

Brynglas Tunnels The Brynglas Tunnels carry the M4 under Brynglas Hill in Newport, Wales. The tunnels are the first and only twin–bored tunnels in the UK motorway network. The tunnels and adjacent M4 motorway Usk bridge were originally planned by Newport ...

. Work commenced on both the bridge and the tunnels on 10 September 1962, two months after work commenced on the George Street Bridge further downstream. The entire Newport bypass section of the M4 (junctions 24 to 28) finally opened in 1967. In 1989, two crossings were added to connect the M4 with the newly constructed junction 25a and the A4042.M4/Newport-Shrewsbury Trunk Road A4042 (Relief of Brynglas Tunnels and Malpas Road) Order 1989
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References

Bridges completed in 1967 Bridges in Newport, Wales Motorway bridges in Wales Usk bridge {{UK-bridge-struct-stub