Thomson

As of September 8, 2026, Thomson is filled to 64.4% of its total capacity, holding roughly 724 hm³ of water out of a maximum 1,123 hm³. At this level the reservoir is within its normal operating range. Of that total, about 1,068 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it is 8.2 points below its level on the same date a year earlier.

Across the readings we hold for Thomson — 1059 data points between September 11, 2023 and September 8, 2026 — the level has ranged from a low of 60.7% (June 29, 2026) to a high of 95.3% (January 13, 2024). On average the reservoir is fullest around November and at its lowest around July.

The dam at Thomson was completed in 1984. It is operated by BOM primarily for water supply. It lies within the Thomson River Basin basin at 37.780°S, 146.364°E.