Reservoir · Montana · United States · BOR RISE
Gibson Reservoir and Dam
69.7% full
Capacity
122.19 hm³
Volume stored
85 hm³
Coordinates
47.601°N, 112.762°W
Last updated
2026-07-28
Current fill
69.7%vs 7 days ago
-1.9%losing
vs 1 year ago
-29.2%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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.601, -112.762 · Open in Google Maps
About Gibson Reservoir and Dam
As of July 28, 2026, Gibson Reservoir and Dam is filled to 69.7% of its total capacity, holding roughly 85 hm³ of water out of a maximum 122 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 1.9 percentage points, and it is 29.2 points below its level on the same date a year earlier.
Across the readings we hold for Gibson Reservoir and Dam — 1890 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 4.7% (February 14, 2025) to a high of 99.7% (June 21, 2022). 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 Montana basin at 47.601°N, 112.762°W.
Key facts
- Current fill level
- 69.7%
- Water stored
- 85 hm³
- Total capacity
- 122 hm³
- 7-day change
- ▼ 1.9 pts
- Year-on-year
- ▼ 29.2 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 47.601°N, 112.762°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 69.7% | 85 |
| 27 Jul 2026 | 71.6% | 88 |
| 26 Jul 2026 | 73.5% | 90 |
| 25 Jul 2026 | 75.3% | 92 |
| 24 Jul 2026 | 77.1% | 94 |
| 23 Jul 2026 | 78.9% | 96 |
| 22 Jul 2026 | 80.6% | 98 |
| 21 Jul 2026 | 82.2% | 100 |
| 20 Jul 2026 | 83.8% | 102 |
| 19 Jul 2026 | 85.4% | 104 |
| 18 Jul 2026 | 86.8% | 106 |
| 17 Jul 2026 | 88.1% | 108 |
Frequently asked questions
What is the current water level of Gibson Reservoir and Dam?
As of July 28, 2026, Gibson Reservoir and Dam is at 69.7% of its capacity, holding approximately 85 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Gibson Reservoir and Dam reservoir full?
No. As of July 28, 2026, Gibson Reservoir and Dam is within its normal operating range at 69.7% of its capacity, so it is not full.
Is the water level at Gibson Reservoir and Dam rising or falling?
The level at Gibson Reservoir and Dam is falling — it dropped 1.9 percentage points over the latest week on record.
How much water can Gibson Reservoir and Dam hold?
Gibson Reservoir and Dam has a total capacity of 122 hm³.
Where is Gibson Reservoir and Dam reservoir located?
Gibson Reservoir and Dam is located in Montana, United States, within the Montana basin (coordinates 47.601°N, 112.762°W).
What is Gibson Reservoir and Dam used for?
Gibson Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.