History in Structure

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Osbaston Weir

A Grade II Listed Building in Monmouth (Trefynwy), Monmouthshire

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Latitude: 51.8212 / 51°49'16"N

Longitude: -2.7251 / 2°43'30"W

OS Eastings: 350116

OS Northings: 213867

OS Grid: SO501138

Mapcode National: GBR FK.WJN3

Mapcode Global: VH86T.QH67

Entry Name: Osbaston Weir

Listing Date: 10 August 2005

Last Amended: 10 August 2005

Grade: II

Source: Cadw

Source ID: 85222

Building Class: Industrial

Location: Across the River Monnow and reached by footpath 150m north of the end of Forge Road on the north side of the town.

County: Monmouthshire

Town: Monmouth

Community: Monmouth (Trefynwy)

Community: Monmouth

Locality: Osbaston

Traditional County: Monmouthshire

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The first mill is recorded on the site in 1628, but this major construction dates probably from the later C18 and provided power for Monmouth Forge. The site was converted to electricity generation in 1899 when turbines were installed, and the sluice gear at the east end of the weir will have been part of this use.


Large stone weir running across the River Monnow and giving a fall of about 3-4m. Dam with concrete top and sandstone and other rubble slope with spillway at the west end and sluice at the north end. The whole construction is about 100m in length and is a considerable piece of engineering.

Reasons for Listing

Included for its special historic interest as a probably late C18 weir associated with Monmouth Forge and Generating Station.

Other nearby listed buildings

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