Reservoir · Idaho · United States · BOR RISE
Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM)
103.1% full
Capacity
36.78 hm³
Volume stored
38 hm³
Coordinates
43.930°N, 116.437°W
Last updated
2026-06-11
Current fill
103.1%vs 7 days ago
-0.1%losing
vs 1 year ago
+0.2%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: 2026-06-11.
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, Diversion Dam, and Powerplant (EMM)
As of June 11, 2026, Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) is filled to 103.1% of its total capacity, holding roughly 38 hm³ of water out of a maximum 37 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) — 2190 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 0.3% (November 25, 2023) to a high of 103.5% (June 15, 2021). 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
- 103.1%
- Water stored
- 38 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▲ 0.2 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 43.930°N, 116.437°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 103.1% | 38 |
| 10 Jun 2026 | 103.2% | 38 |
| 9 Jun 2026 | 103.0% | 38 |
| 8 Jun 2026 | 103.0% | 38 |
| 7 Jun 2026 | 103.1% | 38 |
| 6 Jun 2026 | 103.2% | 38 |
| 5 Jun 2026 | 103.3% | 38 |
| 4 Jun 2026 | 103.2% | 38 |
| 3 Jun 2026 | 103.1% | 38 |
| 2 Jun 2026 | 103.3% | 38 |
| 1 Jun 2026 | 103.1% | 38 |
| 31 May 2026 | 103.2% | 38 |
Frequently asked questions
What is the current water level of Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM)?
As of June 11, 2026, Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) is at 103.1% of its capacity, holding approximately 38 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) reservoir full?
Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) is essentially full, sitting at 103.1% of capacity as of June 11, 2026.
Is the water level at Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) rising or falling?
The level at Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) has been broadly stable over the latest week on record (-0.1 points).
How much water can Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) hold?
Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) has a total capacity of 37 hm³.
Where is Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) reservoir located?
Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) is located in Idaho, United States, within the Idaho basin (coordinates 43.930°N, 116.437°W).
What is Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) used for?
Black Canyon Reservoir, Diversion Dam, and Powerplant (EMM) is used primarily for multiple purposes, and is managed by BOR.