Reservoir · Wyoming · United States · BOR RISE
Fontenelle Reservoir
Fontenelle Reservoir Dam and Powerplant
83.6% full
Capacity
412.49 hm³
Volume stored
345 hm³
Vs month average
111% of normal
Coordinates
42.058°N, 110.097°W
Last updated
2026-10-26
Current fill
83.6%vs 7 days ago
+0.6 ppgaining
vs 1 year ago
+18.7 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
111%of normal
83.6% full on 2026-10-26, against an average of 75.0% for October across 6 years of readings (+8.6 points).
Drought Monitor at this site · 20 October 2026
D2severe drought
The ground at Fontenelle Reservoir's coordinates falls inside the D2 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Wyoming drought figures →
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: 2026-10-26.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.058°N, 110.097°W · Open in Google Maps
About Fontenelle Reservoir
As of October 26, 2026, Fontenelle Reservoir is filled to 83.6% of its total capacity, holding 344.8 hm³ of water out of a maximum 412.49 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.6 pp), and it is 18.7 points above its level on the same date a year earlier.
Across the readings we hold for Fontenelle Reservoir — 1824 data points between October 29, 2021 and October 26, 2026 — the level has ranged from a low of 30.9% (April 13, 2023) to a high of 97.4% (July 22, 2022). On average the reservoir is fullest around July and at its lowest around March.
It is operated by BOR primarily for multiple purposes. It is at 42.058°N, 110.097°W.
Key facts
- Current fill level
- 83.6% of total capacity
- Water stored
- 344.8 hm³
- Total capacity
- 412.49 hm³
- 7-day change
- ▲ 0.6 pp
- Year-on-year
- ▲ 18.7 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 42.058°N, 110.097°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 83.6% | 344.8 |
| 25 Oct 2026 | 83.5% | 344.35 |
| 24 Oct 2026 | 83.4% | 344.17 |
| 23 Oct 2026 | 83.4% | 344.08 |
| 22 Oct 2026 | 83.4% | 343.9 |
| 21 Oct 2026 | 83.3% | 343.63 |
| 20 Oct 2026 | 83.2% | 343.09 |
| 19 Oct 2026 | 83.0% | 342.37 |
| 18 Oct 2026 | 82.8% | 341.74 |
| 17 Oct 2026 | 82.7% | 341.02 |
| 16 Oct 2026 | 82.5% | 340.12 |
| 15 Oct 2026 | 82.1% | 338.86 |