The Bastyan Dam is a concrete-faced rock-fill embankment dam across the Pieman River, located near , in the West Coast region of Tasmania, Australia. Completed in 1983, the resultant reservoir, Lake Rosebery, was established for the purpose of generation of hydroelectricity via the adjacent Bastyan Power Station, a conventional hydroelectric power station. The dam, its reservoir, and the power station are owned and operated by Hydro Tasmania.
Dam and reservoir overview The concrete-face rockfill dam wall is high and long. When full, Lake Rosebery has capacity of and covers , drawn from a catchment area of . The uncontrolled spillway has a flow capacity of .
Located adjacent to the rock-fill embankment dam is the off-stream Bastyan Levee, an earth-filled saddle embankment that is high and long. The levee also impounds Lake Rosebery.
Reservoir
Lake Rosebery is fed by both the Murchison and Mackintosh rivers and their confluence formed the Pieman River, submerged below the lake's surface following the damming in 1983. At the time of the dam's construction, the Emu Bay and the Wee Georgie Wood railway lines were diverted to run close to the reservoir's shore.
In January 2025, of oil entered the reservoir after a tank on private property leaked in heavy rain.
Hydroelectric power station Part of the Pieman River Power Development scheme that comprises four hydroelectric power stations, the Bastyan Power Station is the third station in the scheme. The power station is located aboveground at the foot of the dam wall. Water from the lake is fed to the power station near the centre of the dam wall by a single penstock tunnel.
The power station was commissioned in 1983 by the Hydro Electric Corporation (TAS) and the station has one Fuji Francis-type turbine, with a generating capacity of of electricity. The station output, estimated to be annually, is fed to TasNetworks' transmission grid via a 13.8 kV/220 kV Fuji generator transformer to the outdoor switchyard.
The water discharged from the Bastyan Power Station is impounded by the Reece Dam into Lake Pieman for use in the Reece Power Station.
See also
List of power stations in Tasmania List of reservoirs and dams in Tasmania
References
Further reading
External links
"Lake Roseberry". Inland Fisheries Service