Reservoir · Idaho · United States · BOR RISE
Lake Walcott, Minidoka Dam, and Minidoka Powerplant
38.7% full
Capacity
259.28 hm³
Volume stored
100 hm³
Coordinates
42.670°N, 113.483°W
Last updated
2026-08-12
Current fill
38.7%vs 7 days ago
-1.5%losing
vs 1 year ago
+2.1%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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.670, -113.483 · Open in Google Maps
About Lake Walcott, Minidoka Dam, and Minidoka Powerplant
As of August 12, 2026, Lake Walcott, Minidoka Dam, and Minidoka Powerplant is filled to 38.7% of its total capacity, holding roughly 100 hm³ of water out of a maximum 259 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-1.5 pts), and it is 2.1 points above its level on the same date a year earlier.
Across the readings we hold for Lake Walcott, Minidoka Dam, and Minidoka Powerplant — 2186 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 10.0% (October 12, 2021) to a high of 46.1% (May 27, 2024). On average the reservoir is fullest around May and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 42.670°N, 113.483°W.
Key facts
- Current fill level
- 38.7%
- Water stored
- 100 hm³
- Total capacity
- 259 hm³
- 7-day change
- ▼ 1.5 pts
- Year-on-year
- ▲ 2.1 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 42.670°N, 113.483°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 38.7% | 100 |
| 11 Aug 2026 | 38.8% | 101 |
| 10 Aug 2026 | 39.0% | 101 |
| 9 Aug 2026 | 39.2% | 102 |
| 8 Aug 2026 | 39.0% | 101 |
| 7 Aug 2026 | 39.4% | 102 |
| 6 Aug 2026 | 39.9% | 103 |
| 5 Aug 2026 | 40.2% | 104 |
| 4 Aug 2026 | 40.6% | 105 |
| 3 Aug 2026 | 41.5% | 108 |
| 2 Aug 2026 | 42.1% | 109 |
| 1 Aug 2026 | 42.5% | 110 |
Frequently asked questions
What is the current water level of Lake Walcott, Minidoka Dam, and Minidoka Powerplant?
As of August 12, 2026, Lake Walcott, Minidoka Dam, and Minidoka Powerplant is at 38.7% of its capacity, holding approximately 100 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Lake Walcott, Minidoka Dam, and Minidoka Powerplant reservoir full?
No. As of August 12, 2026, Lake Walcott, Minidoka Dam, and Minidoka Powerplant is low at 38.7% of its capacity, so it is not full.
Is the water level at Lake Walcott, Minidoka Dam, and Minidoka Powerplant rising or falling?
The level at Lake Walcott, Minidoka Dam, and Minidoka Powerplant has been broadly stable over the latest week on record (-1.5 points).
How much water can Lake Walcott, Minidoka Dam, and Minidoka Powerplant hold?
Lake Walcott, Minidoka Dam, and Minidoka Powerplant has a total capacity of 259 hm³.
Where is Lake Walcott, Minidoka Dam, and Minidoka Powerplant reservoir located?
Lake Walcott, Minidoka Dam, and Minidoka Powerplant is located in Idaho, United States, within the Idaho basin (coordinates 42.670°N, 113.483°W).
What is Lake Walcott, Minidoka Dam, and Minidoka Powerplant used for?
Lake Walcott, Minidoka Dam, and Minidoka Powerplant is used primarily for multiple purposes, and is managed by BOR.