The upper weir (W1) is a substantial stone structure sitting upon a small waterfall. It was built to serve the Clydach Mill or Lower Forge, dual leats (one to the mill and one to the canal) still existing in 1838. The canal feeder was later used to drive two waterwheels, one erected in 18891 to drive the sawmill on the canal bank and another erected on the feeder in 1891.2 The upper stone weir, which is in good condition, is still maintained by British Waterways. Modern paddle gearing controls the opening into the southbound feeder, now mostly culverted. The Mond Nickel Works uses the Lock 5-6 pound as a water supply.

Lower Weir, SN 6890 0126,
Upper Weir, SN 6879 0140.

l. Estates, Gloucester. Deed No. 10615 miscellaneous.
2. Estates, Gloucester. Deed No. 14040 miscellaneous.

Stephen Hughes, 15.08.2006.