Foss Reservoir water level
▼ 14.8 points from 99.4% a year ago
Source: data.usbr.gov/rise/api/catalog-item/133988, accessed October 1, 2026. Updated every 6 hours.
Foss Reservoir is at 84.3% of full pool (1637.84 ft) as of September 28, 2026. Foss Reservoir was last full on May 5, 2026 (95% of normal storage). Foss Reservoir is near Foss, Oklahoma.
Foss Reservoir level history
This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Highs and lows are daily readings in the published data, not official records. Source: Bureau of Reclamation daily data.
Storage, % of full pool, since 1988
Foss Reservoir is falling: 84.3% full, down 0.2 percentage points since September 27, 2026.
On this same date last year (September 28, 2025), Foss Reservoir was 99.4% full, 15.1 percentage points higher than today's 84.3%.
Weekly averages of the source's daily readings; older years may be monthly or sparser where that is all the source published. Download the charted data (JSON).
Foss Reservoir map
Foss Reservoir is at 35.5389, -99.1862. Open in OpenStreetMap.
The dam
- Flood control
Sources: nid.sec.usace.army.mil, accessed September 29, 2026 , recreation.gov/camping/gateways/1131, accessed September 29, 2026
Data source: Recreation.gov
On the water
No campgrounds, boat ramps, or swim spots linked to Foss Reservoir yet.
Common questions
- Foss Reservoir is at 84.3% of full pool (1637.84 ft) as of September 28, 2026.
- Foss Reservoir was last full on May 5, 2026, when it held 95% of its normal storage (elevation 1,640.73 ft). This site counts a reservoir as full on a day its storage is at or above 95% of the dam's normal storage (National Inventory of Dams). Many reservoirs rarely reach 100%, even in wet years, because operators release water for irrigation, power or flood control before they fill, so this site treats 95% as full. Based on Bureau of Reclamation daily data since April 1, 1988.
- In Bureau of Reclamation daily data since April 1, 1988, Foss Reservoir's highest elevation was 1,648.22 ft on June 17, 1997. Its lowest after it first filled (October 1, 1989) was 1,621.88 ft on April 11, 2015. These are the highest and lowest daily readings in the published data, not official records.
- Foss Reservoir is near Foss, Oklahoma (35.5389, -99.1862).
- Bureau of Reclamation operates the dam at Foss Reservoir.
- Foss Reservoir's dam is used for Flood control.