Lake Glenmaggie

As of September 8, 2026, Lake Glenmaggie is filled to 97.6% of its total capacity, holding roughly 173 hm³ of water out of a maximum 178 hm³. At this level the reservoir is high. Of that total, about 173 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it sits close to where it was a year earlier.

Across the readings we hold for Lake Glenmaggie — 1070 data points between September 11, 2023 and September 8, 2026 — the level has ranged from a low of 35.9% (June 23, 2025) to a high of 99.5% (October 22, 2023). On average the reservoir is fullest around October and at its lowest around June.

The dam at Lake Glenmaggie was completed in 1926. It is operated by BOM primarily for water supply. It lies within the Macalister River Basin basin at 37.907°S, 146.768°E.