Reservoir · Montana · United States · BOR RISE
Lake Sherburne
Lake Sherburne and Dam
25.6% full
Capacity
83.7 hm³
Volume stored
21 hm³
Coordinates
48.828°N, 113.521°W
Last updated
2026-09-09
Current fill
25.6%vs 7 days ago
-8.9%losing
vs 1 year ago
-24.9%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.828, -113.521 · Open in Google Maps
About Lake Sherburne
As of September 9, 2026, Lake Sherburne is filled to 25.6% of its total capacity, holding roughly 21 hm³ of water out of a maximum 84 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 8.9 percentage points, and it is 24.9 points below its level on the same date a year earlier.
Across the readings we hold for Lake Sherburne — 1969 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 14.0% (September 15, 2021) to a high of 97.8% (June 29, 2026). On average the reservoir is fullest around July and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 48.828°N, 113.521°W.
Key facts
- Current fill level
- 25.6%
- Water stored
- 21 hm³
- Total capacity
- 84 hm³
- 7-day change
- ▼ 8.9 pts
- Year-on-year
- ▼ 24.9 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 48.828°N, 113.521°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 25.6% | 21 |
| 8 Sep 2026 | 26.4% | 22 |
| 7 Sep 2026 | 27.2% | 23 |
| 6 Sep 2026 | 28.3% | 24 |
| 5 Sep 2026 | 29.7% | 25 |
| 4 Sep 2026 | 31.3% | 26 |
| 3 Sep 2026 | 32.8% | 27 |
| 2 Sep 2026 | 34.5% | 29 |
| 1 Sep 2026 | 35.9% | 30 |
| 31 Aug 2026 | 37.3% | 31 |
| 30 Aug 2026 | 39.0% | 33 |
| 29 Aug 2026 | 40.3% | 34 |