Reservoir · Australian Capital Territory · Australia · BOM Water Data Online
Cotter
100.0% full
Capacity
79.4 hm³
Volume stored
79 hm³
River
Cotter River
Year completed
1912
Coordinates
35.317°S, 148.929°E
Last updated
2026-09-09
Current fill
100.0%vs 7 days ago
0.0%stable
vs 1 year ago
0.0%year-over-year
7-day trend
→stable
Data source: Bureau of Meteorology — Water Data Online (KiWIS) — daily mean storage volume, quality-controlled. Capacity from the BOM Water Storages ArcGIS layer (total design capacity in ML). Last reading: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. -35.317, 148.929 · Open in Google Maps
About Cotter
As of September 9, 2026, Cotter is filled to 100.0% of its total capacity, holding roughly 79 hm³ of water out of a maximum 79 hm³. At this level the reservoir is high. Of that total, about 76 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 Cotter — 1095 data points between September 11, 2023 and September 9, 2026 — the level has ranged from a low of 97.2% (March 31, 2026) to a high of 100.0% (September 11, 2023). On average the reservoir is fullest around July and at its lowest around April.
The dam at Cotter was completed in 1912. It is operated by BOM primarily for water supply. It lies within the Cotter River Basin basin at 35.317°S, 148.929°E.
Key facts
- Current fill level
- 100.0%
- Water stored
- 79 hm³
- Total capacity
- 79 hm³
- Usable capacity
- 76 hm³
- 7-day change
- No change
- Year-on-year
- No change
- Primary use
- Water supply
- River
- Cotter River
- River basin
- Cotter River Basin
- Year completed
- 1912
- Operator
- BOM
- Coordinates
- 35.317°S, 148.929°E
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 100.0% | 79 |
| 8 Sep 2026 | 100.0% | 79 |
| 7 Sep 2026 | 100.0% | 79 |
| 6 Sep 2026 | 100.0% | 79 |
| 5 Sep 2026 | 100.0% | 79 |
| 4 Sep 2026 | 100.0% | 79 |
| 3 Sep 2026 | 100.0% | 79 |
| 2 Sep 2026 | 100.0% | 79 |
| 1 Sep 2026 | 100.0% | 79 |
| 31 Aug 2026 | 100.0% | 79 |
| 30 Aug 2026 | 100.0% | 79 |
| 29 Aug 2026 | 100.0% | 79 |