Reservoir · Oklahoma · United States · USACE CWMS
Keystone Lake
43.6% full
Capacity
1,089.41 hm³
Volume stored
475 hm³
Coordinates
36.152°N, 96.252°W
Last updated
2026-09-11
Current fill
43.6%vs 7 days ago
-1.2%losing
vs 1 year ago
N/A7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. Last reading: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.152, -96.252 · Open in Google Maps
About Keystone Lake
As of September 11, 2026, Keystone Lake is filled to 43.6% of its total capacity, holding roughly 475 hm³ of water out of a maximum 1,089 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 (-1.2 pts).
Across the readings we hold for Keystone Lake — 120 data points between May 14, 2026 and September 11, 2026 — the level has ranged from a low of 43.3% (September 9, 2026) to a high of 100.0% (July 1, 2026).
It is operated by USACE primarily for multiple purposes. It lies within the Oklahoma basin at 36.152°N, 96.252°W.
Key facts
- Current fill level
- 43.6%
- Water stored
- 475 hm³
- Total capacity
- 1,089 hm³
- 7-day change
- ▼ 1.2 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.152°N, 96.252°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 43.6% | 475 |
| 10 Sep 2026 | 43.5% | 474 |
| 9 Sep 2026 | 43.3% | 472 |
| 8 Sep 2026 | 43.5% | 474 |
| 7 Sep 2026 | 43.8% | 477 |
| 6 Sep 2026 | 44.1% | 480 |
| 5 Sep 2026 | 44.4% | 484 |
| 4 Sep 2026 | 44.8% | 488 |
| 3 Sep 2026 | 45.0% | 490 |
| 2 Sep 2026 | 45.2% | 493 |
| 1 Sep 2026 | 45.5% | 496 |
| 31 Aug 2026 | 45.8% | 499 |