|The south eastern shores of Lake Corangamite|
The lake is relatively new in geological terms, formed as a result of recent volcanic activity. Several million years ago, prior to the volcanic activity of the late Pliocene and the Pleistocene Epochs which saw the plains of western Victoria strewn with basalt from the hundreds of now extinct volcanoes scattered across the region, water flows were different. During this much earlier period, water from the region would have flowed out of the area, finding its way to the sea.
As volcanic activity in the district increased however, the natural drainage of the district was disrupted. Lava flows blocked rivers and formed lakes. Lake Corangamite is thought to have formed when flows from the Warrion Hill scoria cone prevented drainage to the east - and presumably thence to the Barwon.
|Stony rises along the shoreline of the lake|
|A maar crater near the shores of Lake Corangamite as seen from|
the Red Rock lookout
|Looking west across the receding waters of the lake|
|A 1958 photo of Lake Corangamite, near Pirron Yallock Creek, image held by|
the State Library of Victoria
Whilst it did not result in the predicted catastrophe for Geelong, it caused huge problems for the farmers of the region. Action was demanded! Something needed to be done to drain the water from the region before the work of reclamation could begin. Somehow, the "creeping menace" as the Colac Shire president called it, had to be stopped...