Reservoir · Wyoming · United States · BOR RISE
Fontenelle Reservoir
Fontenelle Reservoir Dam and Powerplant
84.4% full
Capacity
412.49 hm³
Volume stored
348 hm³
Coordinates
42.058°N, 110.097°W
Last updated
2026-09-09
Current fill
84.4%vs 7 days ago
-0.8%losing
vs 1 year ago
+9.0%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.058, -110.097 · Open in Google Maps
About Fontenelle Reservoir
As of September 9, 2026, Fontenelle Reservoir is filled to 84.4% of its total capacity, holding roughly 348 hm³ of water out of a maximum 412 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.8 pts), and it is 9.0 points above its level on the same date a year earlier.
Across the readings we hold for Fontenelle Reservoir — 1824 data points between September 12, 2021 and September 9, 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 lies within the Wyoming basin at 42.058°N, 110.097°W.
Key facts
- Current fill level
- 84.4%
- Water stored
- 348 hm³
- Total capacity
- 412 hm³
- 7-day change
- ▼ 0.8 pts
- Year-on-year
- ▲ 9.0 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.058°N, 110.097°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 84.4% | 348 |
| 8 Sep 2026 | 84.6% | 349 |
| 7 Sep 2026 | 84.7% | 350 |
| 6 Sep 2026 | 84.9% | 350 |
| 5 Sep 2026 | 85.0% | 351 |
| 4 Sep 2026 | 85.1% | 351 |
| 3 Sep 2026 | 85.2% | 351 |
| 2 Sep 2026 | 85.2% | 351 |
| 1 Sep 2026 | 85.2% | 352 |
| 31 Aug 2026 | 85.3% | 352 |
| 30 Aug 2026 | 85.4% | 352 |
| 29 Aug 2026 | 85.6% | 353 |