Reservoir · Idaho · United States · BOR RISE
Henrys Lake and Henrys Lake Dam (HEN)
85.6% full
Capacity
115.29 hm³
Volume stored
99 hm³
Coordinates
44.597°N, 111.354°W
Last updated
2026-07-28
Current fill
85.6%vs 7 days ago
-0.3%losing
vs 1 year ago
-9.3%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: 2026-07-28.
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 and Henrys Lake Dam (HEN)
As of July 28, 2026, Henrys Lake and Henrys Lake Dam (HEN) is filled to 85.6% of its total capacity, holding roughly 99 hm³ of water out of a maximum 115 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.3 pts), and it is 9.3 points below its level on the same date a year earlier.
Across the readings we hold for Henrys Lake and Henrys Lake Dam (HEN) — 2189 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 76.0% (October 21, 2022) to a high of 100.0% (June 19, 2023). On average the reservoir is fullest around June and at its lowest around October.
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
- 85.6%
- Water stored
- 99 hm³
- Total capacity
- 115 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 9.3 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.597°N, 111.354°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 85.6% | 99 |
| 27 Jul 2026 | 85.9% | 99 |
| 26 Jul 2026 | 86.2% | 99 |
| 25 Jul 2026 | 86.5% | 100 |
| 24 Jul 2026 | 87.3% | 101 |
| 23 Jul 2026 | 87.3% | 101 |
| 22 Jul 2026 | 88.0% | 101 |
| 21 Jul 2026 | 87.7% | 101 |
| 20 Jul 2026 | 88.6% | 102 |
| 19 Jul 2026 | 88.8% | 102 |
| 18 Jul 2026 | 89.9% | 104 |
| 17 Jul 2026 | 89.6% | 103 |
Frequently asked questions
What is the current water level of Henrys Lake and Henrys Lake Dam (HEN)?
As of July 28, 2026, Henrys Lake and Henrys Lake Dam (HEN) is at 85.6% of its capacity, holding approximately 99 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Henrys Lake and Henrys Lake Dam (HEN) reservoir full?
No. As of July 28, 2026, Henrys Lake and Henrys Lake Dam (HEN) is high at 85.6% of its capacity, so it is not full.
Is the water level at Henrys Lake and Henrys Lake Dam (HEN) rising or falling?
The level at Henrys Lake and Henrys Lake Dam (HEN) has been broadly stable over the latest week on record (-0.3 points).
How much water can Henrys Lake and Henrys Lake Dam (HEN) hold?
Henrys Lake and Henrys Lake Dam (HEN) has a total capacity of 115 hm³.
Where is Henrys Lake and Henrys Lake Dam (HEN) reservoir located?
Henrys Lake and Henrys Lake Dam (HEN) is located in Idaho, United States, within the Idaho basin (coordinates 44.597°N, 111.354°W).
What is Henrys Lake and Henrys Lake Dam (HEN) used for?
Henrys Lake and Henrys Lake Dam (HEN) is used primarily for multiple purposes, and is managed by BOR.