Reservoir · Idaho · United States · BOR RISE
Milner Lake
Milner Lake and Dam
91.6% full
Capacity
48.11 hm³
Volume stored
44 hm³
Coordinates
42.523°N, 114.014°W
Last updated
2026-09-30
Current fill
91.6%vs 7 days ago
-0.6%losing
vs 1 year ago
-1.1%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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.523, -114.014 · Open in Google Maps
About Milner Lake
As of September 30, 2026, Milner Lake is filled to 91.6% of its total capacity, holding roughly 44 hm³ of water out of a maximum 48 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.6 pts), and it is 1.1 points below its level on the same date a year earlier.
Across the readings we hold for Milner Lake — 2189 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 62.7% (October 14, 2022) to a high of 105.0% (April 30, 2024). 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 42.523°N, 114.014°W.
Key facts
- Current fill level
- 91.6%
- Water stored
- 44 hm³
- Total capacity
- 48 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 1.1 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 42.523°N, 114.014°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 91.6% | 44 |
| 29 Sep 2026 | 91.8% | 44 |
| 28 Sep 2026 | 91.7% | 44 |
| 27 Sep 2026 | 91.1% | 44 |
| 26 Sep 2026 | 91.8% | 44 |
| 25 Sep 2026 | 90.6% | 44 |
| 24 Sep 2026 | 91.9% | 44 |
| 23 Sep 2026 | 92.2% | 44 |
| 22 Sep 2026 | 92.5% | 44 |
| 21 Sep 2026 | 92.6% | 45 |
| 20 Sep 2026 | 93.3% | 45 |
| 19 Sep 2026 | 93.8% | 45 |