Reservoir · Oklahoma · United States · BOR RISE
Fort Cobb Reservoir
Fort Cobb Reservoir and Dam
77.1% full
Capacity
98.69 hm³
Volume stored
76 hm³
Coordinates
35.167°N, 98.450°W
Last updated
2026-09-09
Current fill
77.1%vs 7 days ago
-1.0%losing
vs 1 year ago
-14.1%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. 35.167, -98.450 · Open in Google Maps
About Fort Cobb Reservoir
As of September 9, 2026, Fort Cobb Reservoir is filled to 77.1% of its total capacity, holding roughly 76 hm³ of water out of a maximum 99 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-1.0 pts), and it is 14.1 points below its level on the same date a year earlier.
Across the readings we hold for Fort Cobb Reservoir — 1824 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 74.6% (October 29, 2024) to a high of 105.0% (June 9, 2022). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Oklahoma basin at 35.167°N, 98.450°W.
Key facts
- Current fill level
- 77.1%
- Water stored
- 76 hm³
- Total capacity
- 99 hm³
- 7-day change
- ▼ 1.0 pts
- Year-on-year
- ▼ 14.1 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- BOR
- Coordinates
- 35.167°N, 98.450°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 77.1% | 76 |
| 8 Sep 2026 | 77.3% | 76 |
| 7 Sep 2026 | 77.5% | 76 |
| 6 Sep 2026 | 77.6% | 77 |
| 5 Sep 2026 | 77.7% | 77 |
| 4 Sep 2026 | 77.8% | 77 |
| 3 Sep 2026 | 78.0% | 77 |
| 2 Sep 2026 | 78.1% | 77 |
| 1 Sep 2026 | 78.3% | 77 |
| 31 Aug 2026 | 78.4% | 77 |
| 30 Aug 2026 | 78.5% | 77 |
| 29 Aug 2026 | 78.7% | 78 |