Reservoir · Oklahoma · United States · USACE CWMS
Keystone Lake
41.0% full
Capacity
1,089.41 hm³
Volume stored
446 hm³
Coordinates
36.152°N, 96.252°W
Last updated
2026-10-09
Current fill
41.0%vs 7 days ago
-0.6%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: 2026-10-09.
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 October 9, 2026, Keystone Lake is filled to 41.0% of its total capacity, holding roughly 446 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 (-0.6 pts).
Across the readings we hold for Keystone Lake — 329 data points between October 10, 2021 and October 9, 2026 — the level has ranged from a low of 41.0% (October 8, 2026) to a high of 100.0% (July 1, 2026). On average the reservoir is fullest around June and at its lowest around September.
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
- 41.0%
- Water stored
- 446 hm³
- Total capacity
- 1,089 hm³
- 7-day change
- ▼ 0.6 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.152°N, 96.252°W
- Last updated
- October 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Oct 2026 | 41.0% | 446 |
| 8 Oct 2026 | 41.0% | 447 |
| 7 Oct 2026 | 41.2% | 449 |
| 6 Oct 2026 | 41.3% | 450 |
| 5 Oct 2026 | 41.6% | 453 |
| 4 Oct 2026 | 41.8% | 456 |
| 3 Oct 2026 | 41.8% | 455 |
| 2 Oct 2026 | 41.6% | 454 |
| 1 Oct 2026 | 41.7% | 455 |
| 30 Sep 2026 | 41.7% | 454 |
| 29 Sep 2026 | 41.9% | 456 |
| 28 Sep 2026 | 42.0% | 458 |