The Big Arch is a Grade II listed building in the Torfaen local planning authority area, Wales. First listed on 13 September 1994. Bridge.

The Big Arch

WRENN ID: strange-latch-bone
Grade: II
Local Planning Authority: Torfaen
Country: Wales
Date first listed: 13 September 1994
Type: Bridge
Source: Cadw listing

Description

Constructed of sandstone and brick. The bridge has a semi-circular arch 11m wide of five rings of engineering brick. The arch is 36m long and was constructed as a cut-and-cover tunnel. The revetment walls forming the portals are of bull-nosed sandstone on an unusual L-plan to support the embankment, which is on a skew to the arch. The corners of the L's are rounded and the walls are slightly battered. They slope steeply to the ground from apexes near the track bed level.

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