Lock 1 - Blanchetown

As of September 9, 2026, Lock 1 - Blanchetown is filled to 49.6% of its total capacity, holding roughly 28 hm³ of water out of a maximum 57 hm³. At this level the reservoir is within its normal operating range. Of that total, about 28 hm³ is usable (live) storage.

Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.

Across the readings we hold for Lock 1 - Blanchetown — 1095 data points between September 11, 2023 and September 9, 2026 — the level has ranged from a low of 47.2% (March 26, 2024) to a high of 52.9% (September 20, 2023). On average the reservoir is fullest around February and at its lowest around March.

The dam at Lock 1 - Blanchetown was completed in 1922. It is operated by BOM primarily for water supply. It lies within the River Murray Basin basin at 34.327°S, 139.618°E.