The Blue Lake at Mount Gambier in the state's south east is a volcanic crater that contains groundwater from local aquifer systems. The water seeps into the crater through porous limestone.
The total capacity of water in the lake has been calculated at 36,000 ML, making it the third largest water storage in South Australia. About 10% of the capacity is used each year by the regional City of Mount Gambier. Groundwater recharges the lake.
Water from the lake has been used for reticulated supply since the early 1880s.
The eruption that formed the volcanic crater is believed to have occurred nearly 5000 years ago.
Capacity: 36,000 megalitres.
If this reservoir supplied the whole state, how long would this last? About 61 days.
Area of water spread: 70 hectares.
Open to the public? Yes. Access to SA Water land via organised tours. Access to adjoining Council land (walking trail and other interpretative facilities).
When can I visit? Managed on request. Council facilities available 24 hours a day, 7 days a week.
How full is this reservoir? We currently don't monitor this reservoir's volume.