Reservoir · Montana · United States · BOR RISE
Pishkun Reservoir
Pishkun Reservoir and Dikes
72.1% full
Capacity
57.57 hm³
Volume stored
42 hm³
Coordinates
47.677°N, 112.497°W
Last updated
2026-09-12
Current fill
72.1%vs 7 days ago
-18.2%losing
vs 1 year ago
+8.7%year-over-year
7-day trend
↓falling
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.677, -112.497 · Open in Google Maps
About Pishkun Reservoir
As of September 12, 2026, Pishkun Reservoir is filled to 72.1% of its total capacity, holding roughly 42 hm³ of water out of a maximum 58 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 18.2 percentage points, and it is 8.7 points above its level on the same date a year earlier.
Across the readings we hold for Pishkun Reservoir — 2025 data points between September 15, 2021 and September 12, 2026 — the level has ranged from a low of 59.2% (April 14, 2026) to a high of 100.2% (July 2, 2026). On average the reservoir is fullest around June and at its lowest around February.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 47.677°N, 112.497°W.
Key facts
- Current fill level
- 72.1%
- Water stored
- 42 hm³
- Total capacity
- 58 hm³
- 7-day change
- ▼ 18.2 pts
- Year-on-year
- ▲ 8.7 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 47.677°N, 112.497°W
- Last updated
- September 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Sep 2026 | 72.1% | 42 |
| 11 Sep 2026 | 74.6% | 43 |
| 10 Sep 2026 | 76.9% | 44 |
| 9 Sep 2026 | 79.4% | 46 |
| 8 Sep 2026 | 82.1% | 47 |
| 7 Sep 2026 | 84.7% | 49 |
| 6 Sep 2026 | 87.3% | 50 |
| 5 Sep 2026 | 90.3% | 52 |
| 4 Sep 2026 | 93.5% | 54 |
| 3 Sep 2026 | 97.0% | 56 |
| 2 Sep 2026 | 99.8% | 57 |
| 1 Sep 2026 | 99.9% | 58 |