Reservoir · Idaho · United States · BOR RISE
Henrys Lake
Henrys Lake and Henrys Lake Dam
70.3% full
Capacity
115.29 hm³
Volume stored
81 hm³
Coordinates
44.597°N, 111.354°W
Last updated
2026-09-30
Current fill
70.3%vs 7 days ago
0.0%stable
vs 1 year ago
-11.6%year-over-year
7-day trend
→stable
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. 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. 44.597, -111.354 · Open in Google Maps
About Henrys Lake
As of September 30, 2026, Henrys Lake is filled to 70.3% of its total capacity, holding roughly 81 hm³ of water out of a maximum 115 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 11.6 points below its level on the same date a year earlier.
Across the readings we hold for Henrys Lake — 2187 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 69.2% (September 6, 2026) to a high of 100.0% (June 19, 2023). On average the reservoir is fullest around June and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 44.597°N, 111.354°W.
Key facts
- Current fill level
- 70.3%
- Water stored
- 81 hm³
- Total capacity
- 115 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 11.6 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.597°N, 111.354°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 70.3% | 81 |
| 29 Sep 2026 | 70.2% | 81 |
| 28 Sep 2026 | 70.2% | 81 |
| 27 Sep 2026 | 70.1% | 81 |
| 26 Sep 2026 | 70.1% | 81 |
| 25 Sep 2026 | 70.1% | 81 |
| 24 Sep 2026 | 70.3% | 81 |
| 23 Sep 2026 | 70.3% | 81 |
| 22 Sep 2026 | 70.1% | 81 |
| 21 Sep 2026 | 70.1% | 81 |
| 20 Sep 2026 | 70.1% | 81 |
| 19 Sep 2026 | 70.1% | 81 |