Reservoir · Idaho · United States · BOR RISE
Anderson Ranch Reservoir, Dam, and Powerplant
59.2% full
Capacity
572.6 hm³
Volume stored
339 hm³
Coordinates
43.360°N, 115.450°W
Last updated
2026-08-12
Current fill
59.2%vs 7 days ago
-3.3%losing
vs 1 year ago
-2.6%year-over-year
7-day trend
↓falling
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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.360, -115.450 · Open in Google Maps
About Anderson Ranch Reservoir, Dam, and Powerplant
As of August 12, 2026, Anderson Ranch Reservoir, Dam, and Powerplant is filled to 59.2% of its total capacity, holding roughly 339 hm³ of water out of a maximum 573 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 3.3 percentage points, and it is 2.6 points below its level on the same date a year earlier.
Across the readings we hold for Anderson Ranch Reservoir, Dam, and Powerplant — 2187 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 29.8% (February 8, 2022) to a high of 89.1% (May 14, 2026). On average the reservoir is fullest around June and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 43.360°N, 115.450°W.
Key facts
- Current fill level
- 59.2%
- Water stored
- 339 hm³
- Total capacity
- 573 hm³
- 7-day change
- ▼ 3.3 pts
- Year-on-year
- ▼ 2.6 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 43.360°N, 115.450°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 59.2% | 339 |
| 11 Aug 2026 | 59.6% | 341 |
| 10 Aug 2026 | 59.9% | 343 |
| 9 Aug 2026 | 60.3% | 345 |
| 8 Aug 2026 | 60.9% | 348 |
| 7 Aug 2026 | 61.4% | 352 |
| 6 Aug 2026 | 61.9% | 355 |
| 5 Aug 2026 | 62.5% | 358 |
| 4 Aug 2026 | 63.0% | 361 |
| 3 Aug 2026 | 63.6% | 364 |
| 2 Aug 2026 | 64.1% | 367 |
| 31 Jul 2026 | 65.2% | 373 |
Frequently asked questions
What is the current water level of Anderson Ranch Reservoir, Dam, and Powerplant?
As of August 12, 2026, Anderson Ranch Reservoir, Dam, and Powerplant is at 59.2% of its capacity, holding approximately 339 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Anderson Ranch Reservoir, Dam, and Powerplant reservoir full?
No. As of August 12, 2026, Anderson Ranch Reservoir, Dam, and Powerplant is within its normal operating range at 59.2% of its capacity, so it is not full.
Is the water level at Anderson Ranch Reservoir, Dam, and Powerplant rising or falling?
The level at Anderson Ranch Reservoir, Dam, and Powerplant is falling — it dropped 3.3 percentage points over the latest week on record.
How much water can Anderson Ranch Reservoir, Dam, and Powerplant hold?
Anderson Ranch Reservoir, Dam, and Powerplant has a total capacity of 573 hm³.
Where is Anderson Ranch Reservoir, Dam, and Powerplant reservoir located?
Anderson Ranch Reservoir, Dam, and Powerplant is located in Idaho, United States, within the Idaho basin (coordinates 43.360°N, 115.450°W).
What is Anderson Ranch Reservoir, Dam, and Powerplant used for?
Anderson Ranch Reservoir, Dam, and Powerplant is used primarily for multiple purposes, and is managed by BOR.