Reservoir · Montana · United States · BOR RISE
Bighorn River and BIA Canal near St. Xavier
74.1% full
Capacity
3.55 hm³
Volume stored
3 hm³
Vs month average
124% of normal
Coordinates
45.317°N, 107.918°W
Last updated
2026-10-27
Current fill
74.1%vs 7 days ago
-2.0 pplosing
vs 1 year ago
+12.1 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
124%of normal
74.1% full on 2026-10-27, against an average of 59.8% for October across 6 years of readings (+14.3 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Bighorn River and BIA Canal near St. Xavier's coordinates falls inside the D1 area of 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. 45.317°N, 107.918°W · Open in Google Maps
About Bighorn River and BIA Canal near St. Xavier
As of October 27, 2026, Bighorn River and BIA Canal near St. Xavier is filled to 74.1% of its total capacity, holding 2.63 hm³ of water out of a maximum 3.55 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 2.0 percentage points, and it is 12.1 points above its level on the same date a year earlier.
Across the readings we hold for Bighorn River and BIA Canal near St. Xavier — 1952 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 18.0% (September 13, 2023) to a high of 99.7% (August 7, 2026). On average the reservoir is fullest around July and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It is at 45.317°N, 107.918°W.
Key facts
- Current fill level
- 74.1% of total capacity
- Water stored
- 2.63 hm³
- Total capacity
- 3.55 hm³
- 7-day change
- ▼ 2.0 pp
- Year-on-year
- ▲ 12.1 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 45.317°N, 107.918°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 74.1% | 2.63 |
| 26 Oct 2026 | 90.7% | 3.22 |
| 25 Oct 2026 | 84.5% | 3 |
| 24 Oct 2026 | 79.7% | 2.83 |
| 23 Oct 2026 | 84.8% | 3.01 |
| 22 Oct 2026 | 79.7% | 2.83 |
| 21 Oct 2026 | 91.5% | 3.25 |
| 20 Oct 2026 | 76.1% | 2.7 |
| 19 Oct 2026 | 69.3% | 2.46 |
| 18 Oct 2026 | 72.1% | 2.56 |
| 17 Oct 2026 | 78.0% | 2.77 |
| 16 Oct 2026 | 84.2% | 2.99 |