Reservoir · Oklahoma · United States · BOR RISE
Foss Reservoir and Dam
93.7% full
Capacity
208.13 hm³
Volume stored
195 hm³
Coordinates
35.550°N, 99.183°W
Last updated
2026-06-10
Current fill
93.7%vs 7 days ago
-0.2%losing
vs 1 year ago
-2.2%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: 2026-06-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 35.550, -99.183 · Open in Google Maps
About Foss Reservoir and Dam
As of June 10, 2026, Foss Reservoir and Dam is filled to 93.7% of its total capacity, holding roughly 195 hm³ of water out of a maximum 208 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 2.2 points below its level on the same date a year earlier.
Across the readings we hold for Foss Reservoir and Dam — 1824 data points between June 13, 2021 and June 10, 2026 — the level has ranged from a low of 78.2% (April 24, 2023) to a high of 101.9% (June 18, 2025). On average the reservoir is fullest around July and at its lowest around April.
It is operated by BOR primarily for multiple purposes. It lies within the Oklahoma basin at 35.550°N, 99.183°W.
Key facts
- Current fill level
- 93.7%
- Water stored
- 195 hm³
- Total capacity
- 208 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 2.2 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- BOR
- Coordinates
- 35.550°N, 99.183°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 93.7% | 195 |
| 9 Jun 2026 | 93.9% | 196 |
| 8 Jun 2026 | 94.0% | 196 |
| 7 Jun 2026 | 94.1% | 196 |
| 6 Jun 2026 | 94.2% | 196 |
| 5 Jun 2026 | 94.1% | 196 |
| 4 Jun 2026 | 93.9% | 195 |
| 3 Jun 2026 | 93.9% | 195 |
| 2 Jun 2026 | 93.9% | 195 |
| 1 Jun 2026 | 94.0% | 196 |
| 31 May 2026 | 94.1% | 196 |
| 30 May 2026 | 94.1% | 196 |
Frequently asked questions
What is the current water level of Foss Reservoir and Dam?
As of June 10, 2026, Foss Reservoir and Dam is at 93.7% of its capacity, holding approximately 195 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Foss Reservoir and Dam reservoir full?
No. As of June 10, 2026, Foss Reservoir and Dam is high at 93.7% of its capacity, so it is not full.
Is the water level at Foss Reservoir and Dam rising or falling?
The level at Foss Reservoir and Dam has been broadly stable over the latest week on record (-0.2 points).
How much water can Foss Reservoir and Dam hold?
Foss Reservoir and Dam has a total capacity of 208 hm³.
Where is Foss Reservoir and Dam reservoir located?
Foss Reservoir and Dam is located in Oklahoma, United States, within the Oklahoma basin (coordinates 35.550°N, 99.183°W).
What is Foss Reservoir and Dam used for?
Foss Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.