Reservoir · Idaho · United States · BOR RISE
Black Canyon Reservoir
Black Canyon Reservoir, Diversion Dam, and Powerplant
99.3% full
Capacity
36.78 hm³
Volume stored
37 hm³
Coordinates
43.930°N, 116.437°W
Last updated
2026-09-30
Current fill
99.3%vs 7 days ago
-1.0%losing
vs 1 year ago
+0.4%year-over-year
7-day trend
→stable
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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.930, -116.437 · Open in Google Maps
About Black Canyon Reservoir
As of September 30, 2026, Black Canyon Reservoir is filled to 99.3% of its total capacity, holding roughly 37 hm³ of water out of a maximum 37 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-1.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Black Canyon Reservoir — 2186 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 0.3% (November 25, 2023) to a high of 103.5% (March 31, 2022). On average the reservoir is fullest around July and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 43.930°N, 116.437°W.
Key facts
- Current fill level
- 99.3%
- Water stored
- 37 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 1.0 pts
- Year-on-year
- ▲ 0.4 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 43.930°N, 116.437°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 99.3% | 37 |
| 29 Sep 2026 | 99.4% | 37 |
| 28 Sep 2026 | 99.5% | 37 |
| 27 Sep 2026 | 98.2% | 36 |
| 26 Sep 2026 | 98.9% | 36 |
| 25 Sep 2026 | 99.7% | 37 |
| 24 Sep 2026 | 100.1% | 37 |
| 23 Sep 2026 | 100.3% | 37 |
| 22 Sep 2026 | 100.6% | 37 |
| 21 Sep 2026 | 100.8% | 37 |
| 20 Sep 2026 | 100.8% | 37 |
| 19 Sep 2026 | 100.2% | 37 |