# Bastyan Dam

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Dam and power station in Tasmania, Australia

Dam in Western Tasmania

Bastyan Dam Interactive map of Bastyan Dam Country Australia Location Western Tasmania Coordinates 41°44′08″S 145°32′01″E / 41.735534°S 145.533485°E / -41.735534; 145.533485 Purpose Power Status Operational Construction began 1974 (1974) Opening date 1983 (1983) Owner Hydro Tasmania Dam and spillways Type of dam Rock-fill dam Impounds Pieman River Height 75 m (246 ft) Length 510 m (1,670 ft) Dam volume 570×10^3 m3 (20×10^6 cu ft) Spillways 1 Spillway type Uncontrolled Spillway capacity 2,806 m3/s (99,100 cu ft/s) Reservoir Creates Lake Rosebery Total capacity 123.52 GL (100,140 acre⋅ft) Catchment area 1,397 km2 (539 sq mi) Surface area 74.4 ha (184 acres) Normal elevation 154 m (505 ft) AHD Bastyan Power Station Coordinates 41°43′48″S 145°31′48″E / 41.73000°S 145.53000°E / -41.73000; 145.53000 Operator Hydro Tasmania Commission date 1993 (1993) Type Conventional Hydraulic head 61 m (200 ft) Turbines 1 x 81 MW (109,000 hp) Fuji Francis-type Installed capacity 81 MW (109,000 hp) Capacity factor 0.85 Annual generation 405 GWh (1,460 TJ) Website hydro.com.au [1]

The **Bastyan Dam** is a concrete-faced rock-fill [embankment dam](/source/Embankment_dam) across the [Pieman River](/source/Pieman_River), located near [Tullah](/source/Tullah%2C_Tasmania), in the [West Coast](/source/West_Coast%2C_Tasmania) region of [Tasmania](/source/Tasmania), Australia. Completed in 1983, the resultant [reservoir](/source/Reservoir), [Lake Rosebery](/source/Lake_Rosebery_(Tasmania)), was established for the purpose of generation of [hydroelectricity](/source/Hydroelectricity) via the adjacent **Bastyan Power Station**, a [conventional](/source/Hydroelectricity#Conventional_(dams)) hydroelectric [power station](/source/Power_station). The dam, its reservoir, and the power station are owned and operated by [Hydro Tasmania](/source/Hydro_Tasmania).

## Dam and reservoir overview

The concrete-face [rockfill dam](/source/Rockfill_dam) wall is 75 metres (246 ft) high and 510 metres (1,670 ft) long. When full, Lake Rosebery has capacity of 123.52 [gigalitres](/source/Gigalitre) (100,140 [acre⋅ft](/source/Acre-foot)) and covers 744 hectares (1,840 acres), drawn from a [catchment area](/source/Drainage_basin) of 1,397 square kilometres (539 sq mi). The [uncontrolled spillway](/source/Spillway#Types) has a flow capacity of 2,806 cubic metres per second (99,100 cu ft/s).[1]

Located adjacent to the rock-fill embankment dam is the off-stream **Bastyan Levee**, an [earth-filled](/source/Earth-filled_dam) [saddle embankment](/source/Dam#Saddle_dam) that is 14 metres (46 ft) high and 55 metres (180 ft) long. The levee also impounds Lake Rosebery.[1]

### Reservoir

A view of the lake

Lake Rosebery is fed by both the [Murchison](/source/Murchison_River_(Tasmania)) and [Mackintosh](/source/Mackintosh_River) rivers and their [confluence](/source/Confluence) formed the Pieman River, submerged below the lake's surface following the damming in 1983.[2] At the time of the dam's construction, the [Emu Bay](/source/Melba_Line%2C_Tasmania) and the [Wee Georgie Wood](/source/Wee_Georgie_Wood_Railway) railway lines were diverted to run close to the reservoir's shore.

In January 2025, 4,000 to 5,000 litres (880 to 1,100 imp gal; 1,100 to 1,300 US gal) of oil entered the reservoir after a tank on private property leaked in heavy rain.[3]

## Hydroelectric power station

Part of the [Pieman River Power Development](/source/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 150-metre (490 ft) single [penstock](/source/Penstock) tunnel.[4]

The power station was commissioned in 1983 by the [Hydro Electric Corporation (TAS)](/source/Hydro_Tasmania) and the station has one [Fuji](/source/Fuji_Heavy_Industries) [Francis-type](/source/Francis_turbine) [turbine](/source/Water_turbine), with a generating capacity of 81 megawatts (109,000 hp) of electricity. The station output, estimated to be 405 [gigawatt-hours](/source/Kilowatt-hour) (1,460 [TJ](/source/Terajoule)) annually,[1] is fed to [TasNetworks](/source/TasNetworks)' transmission grid via a 13.8 k[V](/source/Voltage)/220 kV Fuji generator transformer to the outdoor switchyard.[5]

The water discharged from the Bastyan Power Station is impounded by the [Reece Dam](/source/Reece_Dam) into [Lake Pieman](/source/Lake_Pieman) for use in the Reece Power Station.

## See also

- [Renewable energy portal](https://en.wikipedia.org/wiki/Portal:Renewable_energy)
- [Australia portal](https://en.wikipedia.org/wiki/Portal:Australia)
- [Water portal](https://en.wikipedia.org/wiki/Portal:Water)

- [List of power stations in Tasmania](/source/List_of_power_stations_in_Tasmania)

- [List of reservoirs and dams in Tasmania](/source/List_of_reservoirs_and_dams_in_Australia#Tasmania)

## References

1. ^ [***a***](#cite_ref-ANCOLD_1-0) [***b***](#cite_ref-ANCOLD_1-1) [***c***](#cite_ref-ANCOLD_1-2) [***d***](#cite_ref-ANCOLD_1-3) ["Register of Large Dams Australia-2015"](https://ancold.org.au/information-resources/dams-information/) ([Excel](/source/Microsoft_Excel). Requires download. Rows 21-22). *[ANCOLD](/source/ANCOLD)*. January 2022. Retrieved 5 March 2026.

1. **[^](#cite_ref-2)** ["Map of Lake Rosebery, TAS"](http://www.bonzle.com.au/c/a?a=p&p=168415&cmd=sp). *Bonzle Digital Atlas of Australia*. Retrieved 21 June 2016.

1. **[^](#cite_ref-ptlf_3-0)** Powell, Sandy (25 January 2025). ["Popular Tasmanian lake off-limits after oil spill but is someone to blame?"](https://www.abc.net.au/news/2025-01-25/lake-rosebery-tasmania-oil-spill-property-owners/104854864). *ABC News*. Retrieved 25 January 2025.

1. **[^](#cite_ref-4)** ["Pieman"](http://www.hydro.com.au/energy/our-power-stations/pieman). *Energy*. [Hydro Tasmania](/source/Hydro_Tasmania). Retrieved 4 July 2015.

1. **[^](#cite_ref-5)** ["Bastyan Power Station: Technical fact sheet"](https://web.archive.org/web/20230618040802/https://www.hydro.com.au/docs/default-source/clean-energy/our-power-stations/power-station-fact-sheets/bastyan-power-station-fact-sheet.pdf?sfvrsn=5bcd9b28_2) (PDF). *Pieman Catchment*. [Hydro Tasmania](/source/Hydro_Tasmania). Archived from [the original](https://www.hydro.com.au/docs/default-source/clean-energy/our-power-stations/power-station-fact-sheets/bastyan-power-station-fact-sheet.pdf?sfvrsn=5bcd9b28_2) (PDF) on 18 June 2023. Retrieved 18 June 2023.

## Further reading

- Hepper, Marriott & Associates (1984). *Lake Rosebery recreation development plan*. Hobart: Hepper, Marriott. [ISBN](/source/ISBN_(identifier)) [1-86252-515-3](https://en.wikipedia.org/wiki/Special:BookSources/1-86252-515-3).

## External links

- ["Pieman Sustainability Review: Information review of the Anthony-Pieman hydropower scheme"](https://www.hydro.com.au/docs/default-source/environment-page/pieman-sustainability-review/pieman-sustainability-review-full-report.pdf?sfvrsn=85a1e328_0) (PDF). [Hydro Tasmania](/source/Hydro_Tasmania). February 2015. [Archived](https://web.archive.org/web/20230618034627/https://www.hydro.com.au/docs/default-source/environment-page/pieman-sustainability-review/pieman-sustainability-review-full-report.pdf?sfvrsn=85a1e328_0) (PDF) from the original on 18 June 2023. Retrieved 18 June 2023.

- ["Tullah, Tasmania"](http://www.westernwilderness.com.au/tullah_tasmania). *Western Wilderness*. [West Coast Council](/source/West_Coast_Council). 2018.

- ["Lake Roseberry"](https://www.ifs.tas.gov.au/fisheries/waters-a-z/lake-rosebery/). *Inland Fisheries Service*

v t e Dams and reservoirs in Tasmania, Australia Central Highlands Arthurs Lake Catagunya Clark Cluny Lake Binney Lake Echo Liapootah Meadowbank Miena Pine Tier Repulse Wayatinah King Island Upper Grassy North East Briseis Cascade Clarence Curries River Duck Reach Weir Frome Monarch Mount Paris North West Guide River Henty Pet River White Spur Northern Augusta Cethana Devils Gate Ford Mackenzie Meander Paloona Parangana Rowallan Taylor No. 3 Trevally Wilmot South Craigbourne Flagstaff Gully Hall No. 2 Knights Creek Limekiln Gully Lower Reservoir Ridgeway Rileys Creek Risdon Brook Stanton South West Edgar Gordon Laughing Jack Scotts Peak Serpentine Western Anthony and levee Bastyan and levee Crotty Darwin Mackintosh Tullabardine Margaret Murchison Newton Reece Decommissioned Tolosa Park Category | List

v t e Energy in Tasmania Hydroelectric Derwent Butlers Gorge Catagunya Cluny Lake Echo Liapootah Meadowbank Nieterana Repulse Tarraleah Tungatinah Wayatinah Gordon-Pedder Gordon Franklin Dam controversy Mersey-Forth Cethana Devils Gate Fisher Lemonthyme Paloona Parangana Rowallan Wilmot West Coast King John Butters Lake Margaret Pieman / Anthony Bastyan Mackintosh Reece Tribute Yingina / Great Lake Poatina Tods Corner Trevallyn Others Huntsman Decommissioned Duck Reach Moorina Waddamana Waddamana B Wind farms Granville Harbour Musselroe Woolnorth Cattle Hill Huxley Hill (King Island) Natural gas Tamar Valley Decommissioned Bell Bay Organisations Alinta Aurora Powerco Hydro Tasmania Roaring 40s TasNetworks Former Transend Networks Interconnectors Basslink Planned Marinus Link Other Office of the Tasmanian Economic Regulator 2016 Tasmanian energy crisis List of power stations in Tasmania

v t e Western region of Tasmania, Australia Cities and other settlements Queenstown Crotty Darwin Dundas Gormanston Guildford Linda Pillinger Regatta Point Rosebery Strahan Tullah Waratah Williamsford Zeehan Governance Braddon (federal) Braddon (state) Franklin Land District Montgomery Land District Montagu Land District West Coast Council Lyell Murchison Zeehan Mountains West Coast Range Black Darwin Dundas Heemskirk Huxley Jukes Lyell Murchison Owen Read Read Volcanics Sedgwick Sorell Strahan Zeehan Tyndall Geikie Tyndall Eldon Eldon Peak Engineer unnamed peak Raglan unnamed peak Sticht unnamed peak National parks Franklin-Gordon Wild Rivers Tasmanian Wilderness World Heritage Area Rivers Anne Anthony Franklin Gordon Henty King Lea Mackintosh Murchison Pieman Queen Sophia Lakes Beatrice Burbury Dora Gordon Mackintosh Murchison Pieman Rosebery Westwood Dams Anthony Crotty Darwin Gordon Henty Mackintosh Tullabardine Lake Margaret Murchison Reece Power stations Anthony Power Development Bastyan Gordon John Butters Lake Margaret Mackintosh Reece Tribute Transport Anthony Road Hercules Haulage Lyell Highway Murchison Highway Queenstown Airport Strahan Airport Railways Emu Bay Macquarie Heads breakwater Melba Mount Dundas-Zeehan North East Dundas North Mount Lyell Wee Georgie Wood West Coast Wilderness Zeehan-Strahan Railway stations and former railway stations Queenstown Zeehan Landmarks Natural Birchs Inlet Cape Sorell Darwin Crater Granville Harbour Hells Gates Iron Blow Kelly Basin Linda Valley Macquarie Harbour Montezuma Falls Nelson Falls Ocean Beach Trial Harbour Man-made Cape Sorell Lighthouse Gaiety Theatre Galley Museum Paragon Theatre Queenstown Oval People of note Convicts on the West Coast Crotty Davey Gould Joyce Long Moore Pearce Piguenit Piners Sticht Whitham Mining Comstock Mine Copper Mines Henty Gold Mine Mount Jukes Mine sites Mount Lyell Mining & Railway Company Mount Lyell Remediation and Research and Demonstration Program North Mount Lyell North Mount Lyell Disaster (1912) Renison Bell Stichtite West Coast Tasmania Mines Books and newspapers For the Term of His Natural Life Gould's Book of Fish The Peaks of Lyell West Coast Miner Zeehan & Dundas Herald Other Darwin glass The Unconformity Round Earth Theatre Company Tasmanian West bioregion Western Tasmanian Football Association Western Tasmanian languages

v t e Lakes and other bodies of water in Tasmania, Australia Coastal lagoons and lakes Bronte Dulverton Jocks Orielton Little Waterhouse Freshwater Beatrice Dora Flannigan Meston St Clair Flooded Arthurs Brady Chain Binney Bradys Bronte Dee Echo Pine Tier Tungatinah Great King William Pedder Edgar Glacial Dove Selina Westwood Salt Fidler (Meromictic) Man-made reservoirs Barrington Burbury Catagunya Cethana Craigbourne Gairdner Gordon Henty Huntsman Liapootah Mackenzie Mackintosh Margaret Meadowbank Murchison Paloona Parangana Pieman Plimsoll Repulse Rowallan Rosebery Trevallyn Wayatinah Lakes portal

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Adapted from the Wikipedia article [Bastyan Dam](https://en.wikipedia.org/wiki/Bastyan_Dam) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Bastyan_Dam?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.