Australia's Largest Dam: Gordon Dam, Tasmania

Gordon Dam** on the **Gordon River** in **southwestern Tasmania** is **Australia's largest dam by storage capacity** and one of its tallest arch dams.

Key Specifications

ParameterValue
TypeDouble-curvature concrete arch dam
Height (crest)140 m (459 ft)
Crest Length198 m (650 ft)
Base Width18 m (59 ft)
ReservoirLake Gordon
Gross Capacity12,492,934 ML (12.5 km³ / 9.95 million acre-ft)
Active Capacity11,316,000 ML
Catchment Area1,280 km²
Power StationGordon Power Station (432 MW, 3 × 144 MW Francis turbines)
Annual Generation~1,800 GWh (~13% of Tasmania's electricity)
Construction1974–1978 (Hydro-Electric Commission)

Why It's the Largest

  • Storage volume exceeds all other Australian dams (next: **Lake Eucumbene / Eucumbene Dam**, Snowy Scheme — 4,798,000 ML).
  • Height is 2nd after **Tumut Pond Dam** (161 m, Snowy Mountains) but Gordon's *arch* form in a narrow gorge is more dramatic.

Engineering Significance

  • **Double curvature** (arch + crown cantilever) transfers load to abutments — efficient for narrow gorges.
  • **Construction innovation:** Cableway placement, pre-cooled concrete (ice), grout curtain 120 m deep.
  • **Seismic design:** Tasmania is low-seismicity; but dam meets modern criteria.

Environmental Controversy

Gordon Dam was the **flashpoint of Australia's first major environmental campaign** — the **Franklin River dispute (1979–83)**. The proposed **Franklin-below-Gordon Dam** would have flooded the Franklin River wilderness. **High Court (1983)** upheld federal World Heritage legislation, stopping it. Gordon Dam itself flooded Lake Pedder (1972) — earlier controversy.

Tourism & Access

  • Location: 2.5 hrs drive from Hobart via Lyell Highway (A10).
  • Viewing: Dam wall walkway (guided tours summer), Gordon River Rd lookout.
  • Gordon River Cruises: From Strahan (West Coast) — traverse Lake Gordon, enter **Gordon River** (World Heritage wilderness).
  • Pedder Wilderness Lodge (nearby) — accommodation.

Other Notable Australian Dams

  • Eucumbene Dam (Snowy) — largest *mainland* storage.
  • Tumut Pond Dam — highest (161 m).
  • Warragamba Dam (Sydney) — largest *urban supply* (2,031,000 ML).
  • Ord River Dam (Lake Argyle) — largest *tropical* storage (10,760,000 ML).

Gordon Dam is a **monument of mid-century hydro-industrial ambition** — now operating within a World Heritage Area that almost wasn't. Its waters power Tasmania's clean grid while the Franklin runs free beside it.

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