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
2026-06-10
Current fill
100.0%vs 7 days ago
0.0%stable
vs 1 year ago
+2.4%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: 2026-06-10.
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 June 10, 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 is 2.4 points above its level on the same date a year earlier.
Across the readings we hold for Cotter — 1095 data points between June 12, 2023 and June 10, 2026 — the level has ranged from a low of 97.2% (March 31, 2026) to a high of 100.0% (June 12, 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
- ▲ 2.4 pts
- 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
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 100.0% | 79 |
| 9 Jun 2026 | 100.0% | 79 |
| 8 Jun 2026 | 100.0% | 79 |
| 7 Jun 2026 | 100.0% | 79 |
| 6 Jun 2026 | 99.9% | 79 |
| 5 Jun 2026 | 99.6% | 79 |
| 4 Jun 2026 | 99.3% | 79 |
| 3 Jun 2026 | 99.0% | 79 |
| 2 Jun 2026 | 98.9% | 79 |
| 1 Jun 2026 | 98.9% | 78 |
| 31 May 2026 | 98.8% | 78 |
| 30 May 2026 | 98.8% | 78 |
Frequently asked questions
What is the current water level of Cotter?
As of June 10, 2026, Cotter is at 100.0% of its capacity, holding approximately 79 hm³ of water, according to BOM data.
Is Cotter reservoir full?
Cotter is essentially full, sitting at 100.0% of capacity as of June 10, 2026.
Is the water level at Cotter rising or falling?
The level at Cotter has been broadly stable over the latest week on record (0.0 points).
How much water can Cotter hold?
Cotter has a total capacity of 79 hm³, of which about 76 hm³ is usable storage.
Where is Cotter reservoir located?
Cotter is located in Australian Capital Territory, Australia, within the Cotter River Basin basin (coordinates 35.317°S, 148.929°E).
When was Cotter dam built?
The dam at Cotter was completed in 1912.
What is Cotter used for?
Cotter is used primarily for water supply, and is managed by BOM.