Reservoir · Montana · United States · BOR RISE
Lake Sherburne
Lake Sherburne and Dam
19.3% full
Capacity
83.7 hm³
Volume stored
16 hm³
Vs month average
59% of normal
Coordinates
48.828°N, 113.521°W
Last updated
2026-10-27
Current fill
19.3%vs 7 days ago
+0.9 ppgaining
vs 1 year ago
-27.9 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
59%of normal
19.3% full on 2026-10-27, against an average of 32.7% for October across 6 years of readings (-13.4 points).
Drought Monitor at this site · 20 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.828°N, 113.521°W · Open in Google Maps
About Lake Sherburne
As of October 27, 2026, Lake Sherburne is filled to 19.3% of its total capacity, holding 16.16 hm³ of water out of a maximum 83.7 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (+0.9 pp), and it is 27.9 points below its level on the same date a year earlier.
Across the readings we hold for Lake Sherburne — 1970 data points between October 29, 2021 and October 27, 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 is at 48.828°N, 113.521°W.
Key facts
- Current fill level
- 19.3% of total capacity
- Water stored
- 16.16 hm³
- Total capacity
- 83.7 hm³
- 7-day change
- ▲ 0.9 pp
- Year-on-year
- ▼ 27.9 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 48.828°N, 113.521°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 19.3% | 16.16 |
| 26 Oct 2026 | 19.1% | 16.02 |
| 25 Oct 2026 | 19.0% | 15.92 |
| 24 Oct 2026 | 18.9% | 15.82 |
| 23 Oct 2026 | 18.8% | 15.72 |
| 22 Oct 2026 | 18.7% | 15.62 |
| 21 Oct 2026 | 18.5% | 15.5 |
| 20 Oct 2026 | 18.4% | 15.38 |
| 19 Oct 2026 | 18.3% | 15.29 |
| 18 Oct 2026 | 18.1% | 15.16 |
| 17 Oct 2026 | 18.0% | 15.09 |
| 16 Oct 2026 | 17.9% | 15 |