South 32 Dendrobium coal mine, in the Metropolitan Special Area, created to protect the waters of Cataract, Cordeaux, Avon and Nepean Reservoirs. Description The Cataract Dam is built of cyclopean masonry composed of sandstone blocks, weighing from , quarried at the site and bedded in a cement mortar. The vertical joints were filled with basalt or sandstone concrete. The upstream face consisted of basalt concrete moulded blocks set in a cement mortar. The downstream face was of basalt concrete, thick in the lower section and thick in the upper levels. There were two lines of diameter pipes which passed through the dam and discharged water into the river. The flow is now controlled by an AGE Ring Faulkner valve. There is also a Ring Faulkner Gate Valve and a Fixed Crane Dispersion Valve. The dam wall was given a decorative finish. The upstream parapet was castellated with sandstone blocks, whilst the top of the downstream wall was corbelled in concrete. Near the centre of the dam wall stands the valve house, finished in sandstone ashlar masonry. It has a slate clad, hipped roof featuring ridgecap finials and with parapet gable ends on the north and south sides and segmental arched parapets on the east and west sides. Specifications for Cataract Dam: Date of construction: 1902 - 1907. Masonry in wall and spillway: . Length of dam: . Length of bywash: . Width at base: . Width at crest: . Greatest depth of water: . Full supply level: . Area of lake: . Capacity: . The water from Cataract Dam is discharged as required into the Cataract River downstream to Broughton's Pass. There it is diverted by another weir into Cataract Tunnel, long, (the first structure of the Upper Canal) by which it is conveyed to Prospect Reservoir. Associated with the Dam is the Cataract Dam Official Quarters, situated close to the dam wall at the northern end. This single-storey, Federation Queen Anne style house was built in 1910 for the use of Water Board staff during construction of the dam. It is built of ashlar sandstone masonry quarried on the site and features a verandah at the front with elaborate timber posts with curved quadrant brackets, a vertical slatted balustrade and pediment gable over the main entrance way. When built, the house contained a board room, offices, four bedrooms and a kitchen. Over the years, it has provided accommodation for