History in Structure

This site is entirely user-supported. See how you can help.

Water Balanced Incline and Drumhouse

A Grade II Listed Building in Corris, Gwynedd

Approximate Location Map
Large Map »
Street View
Contributor Photos »

Street View is the best available vantage point looking, if possible, towards the location of the building. In some locations, Street View may not give a view of the actual building, or may not be available at all. Where it is not available, the satellite view is shown instead.


Latitude: 52.6745 / 52°40'28"N

Longitude: -3.8241 / 3°49'26"W

OS Eastings: 276765

OS Northings: 310093

OS Grid: SH767100

Mapcode National: GBR 93.4P39

Mapcode Global: WH687.718H

Entry Name: Water Balanced Incline and Drumhouse

Listing Date: 6 December 1999

Last Amended: 6 December 1999

Grade: II

Source: Cadw

Source ID: 22726

Building Class: Industrial

Location: Aberllefenni quarry lies on the NW branch road leading off the Aberllefenni to Aberangell road. The incline lies back c150m SW of the road.

County: Gwynedd

Town: Machynlleth

Community: Corris

Community: Corris

Locality: Aberllefenni

Traditional County: Merionethshire

Find accommodation in


The winning of slate slab at Aberllefenni appears to have begun as early as the C14 in the upper level of Craig Hen-gau, and lower levels were successively exploited, there being some record of slate production in the C16. In the C17 it was in the hands of the Lloyd family, passing to the Campbells in 1725, and, in 1801 to the bankers, Hoares. In 1870 it had an innovative manager, R Hughes, who was responsible for its then success. There were as many as 5 inclines, leading down to the slab mill on the valley floor. The Aberllefenni Slate Quarries reached their maximum production in the 1880s when some 183 men were employed, the output being 4,814 tons (4,891,024kg) in 1883. The water balance incline was one of two, and probably dates from the 1880s.


The drumhouse is at the top of the incline between levels 5 and 6 of the quarry. It has gabled walls rising to a pitched roof, now lacking slates, with an internal offset carrying bearing beams for the drum shaft. The drum is c1.6m in diameter, 2.76m long between iron disks flanges, and is battened with timber. It has a rim band brake operated from an extended lever at the S end. The twisted steel cable is 25mm in diameter and secures the riveted iron plate water vessel, 1.86m x 2.16m x 1.65-0.63m deep mounted on a wooden frame on two axles with curved spoked flanged wheels engaging with top-hat section rails. These are spiked to timber sleepers set flush into the slate-on-edge surface of the incline. A water delivery pipe, 78mm in diameter, passes through the drumhouse to discharge over the water vessel. At the side of the drumhouse there is a ruined lean-to.

Reasons for Listing

The incline is of particular interest for the unusual use of water to balance the slate cars, and is included as a particularly well preserved example of this type of internal transportation system, and one which clearly illustrates the methods employed by the C19 slate industry.

Scheduled Ancient Monument ME185(GWY).

Other nearby listed buildings

  • II The Bell House
    The building stands isolated but close to the road at the N end of the village.
  • II* Plas Aberllefenni
    The house stands at the N end of Aberllefenni, in a loop of the road running to the E to Aberangell.
  • II Cymerau Cottages
    The row of 4 cottages is set back from the track at the S end of the road running up Cwm Ratcoed, an
  • II Cymerau Cottages
    The row of four cottages is set back from the track at the S end of the road running up Cwm Ratgoed,
  • II Cymerau Cottages
    The row of four cottages is set back from the track at the S end of the road running up Cwm Ratgoed,
  • II Cymerau Cottages
    The row of four cottages is set back fromt he track, near the S end of the road running up Cwm Ratgo
  • II Hen-gau
    The farmhouse is located on the W side of the valley under Fron-fawr, facing E with farm buildings s

BritishListedBuildings.co.uk is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact BritishListedBuildings.co.uk for any queries related to any individual listed building, planning permission related to listed buildings or the listing process itself.

British Listed Buildings is a Good Stuff website.