Qualla: Copeton Dam

Copeton Dam: Introduction

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Hullwarren, CC BY-SA 3.0. When Lake Copeton is full, it holds about three times the water of Sydney Harbour — more than 1.3 million megalitres pressed against a wall of rock and clay 113 metres high and nearly a kilometre and a half long. Out here, southwest of Inverell in the New England country, that scale feels almost improbable against the dry, rolling hills. But the numbers are the smaller story. The larger one swims somewhere in the deep, cool water: Murray cod the size of a person's leg, ambush predators that have made this artificial lake one of the most famous freshwater fishing destinations in New South Wales. Copeton is engineering and ecology tangled together, a Cold War–era public work that turned a river valley into a fishery and a playground.

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Image: Hullwarren | CC BY-SA 3.0

Copeton Dam: Taming the Gwydir

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Userid42, Public domain. Construction began in March 1968, the dam was commissioned in 1973, and the works were completed in 1976. The New South Wales Water Conservation and Irrigation Commission built it across the Gwydir River — a tributary of the Barwon — to bank water for farms downstream, roughly 35...

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Image: Userid42 | Public domain

Copeton Dam: Water That Grows Cotton

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Peter Jones, CC BY-SA 4.0. Released into the Gwydir, Copeton's water feeds a string of weirs and channels that irrigate around 30,000 hectares of farmland — less than the 50,000 hectares originally planned, because the channels lost more to seepage and evaporation than the engineers expected. Even so, the ...

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Image: Peter Jones | CC BY-SA 4.0

Copeton Dam: The Spillway That Surprised the World

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Tentotwo, CC BY-SA 3.0. Copeton handed its builders a genuine engineering puzzle. The unlined spillway channel was cut through hard, sound, unweathered granite — rock that should have shrugged off rushing water. Instead it eroded, and the cause was unusual enough that it has not been reported anywhere e...

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Image: Tentotwo | CC BY-SA 3.0

Copeton Dam: A Lake for Cod and Quiet

Mon, 22 Jun 2026 00:00:00 GMT

Photo credit Mokgen at English Wikipedia, CC BY-SA 3.0. For most visitors, Copeton is not infrastructure but recreation. Lake Copeton spreads across thousands of hectares, its shoreline given over to sailing, windsurfing, water skiing, boating, swimming and — above all — fishing. Anglers come from across the country chasing the lake's...

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Image: Mokgen at English Wikipedia | CC BY-SA 3.0