Reservoir · Montana · United States · BOR RISE
Lake Sherburne
Lake Sherburne and Dam
17.4% full
Capacity
83.7 hm³
Volume stored
15 hm³
Vs month average
53% of normal
Coordinates
48.828°N, 113.521°W
Last updated
2026-10-12
Current fill
17.4%vs 7 days ago
+1.3%gaining
vs 1 year ago
-27.8%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
53%of normal
17.4% full on 2026-10-12, against an average of 32.8% for October across 6 years of readings (-15.4 points).
Drought Monitor at this site · 6 October 2026
Nonenot in a drought category
Lake Sherburne's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Montana drought figures →
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: 2026-10-12.
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 October 12, 2026, Lake Sherburne is filled to 17.4% of its total capacity, holding roughly 15 hm³ of water out of a maximum 84 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+1.3 pts), and it is 27.8 points below its level on the same date a year earlier.
Across the readings we hold for Lake Sherburne — 1970 data points between October 14, 2021 and October 12, 2026 — the level has ranged from a low of 14.3% (September 22, 2026) 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
- 17.4%
- Water stored
- 15 hm³
- Total capacity
- 84 hm³
- 7-day change
- ▲ 1.3 pts
- Year-on-year
- ▼ 27.8 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 48.828°N, 113.521°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 17.4% | 15 |
| 11 Oct 2026 | 17.1% | 14 |
| 10 Oct 2026 | 16.8% | 14 |
| 9 Oct 2026 | 16.8% | 14 |
| 8 Oct 2026 | 16.6% | 14 |
| 7 Oct 2026 | 16.5% | 14 |
| 6 Oct 2026 | 16.3% | 14 |
| 5 Oct 2026 | 16.1% | 13 |
| 4 Oct 2026 | 15.9% | 13 |
| 3 Oct 2026 | 15.8% | 13 |
| 2 Oct 2026 | 15.6% | 13 |
| 1 Oct 2026 | 15.4% | 13 |