Reservoir · Oklahoma · United States · USACE CWMS
Keystone Lake
49.1% full
Capacity
1,089.41 hm³
Volume stored
535 hm³
Vs month average
110% of normal
Coordinates
36.152°N, 96.252°W
Last updated
2026-10-28
Current fill
49.1%vs 7 days ago
+0.6 ppgaining
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
110%of normal
49.1% full on 2026-10-28, against an average of 44.6% for October across 2 years of readings (+4.5 points).
Drought Monitor at this site · 20 October 2026
D0abnormally dry
The ground at Keystone Lake's coordinates falls inside the D0 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Oklahoma drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.152°N, 96.252°W · Open in Google Maps
About Keystone Lake
As of October 28, 2026, Keystone Lake is filled to 49.1% of its total capacity, holding 534.54 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 pp).
Across the readings we hold for Keystone Lake — 330 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 40.4% (October 13, 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 is at 36.152°N, 96.252°W.
Key facts
- Current fill level
- 49.1% of total capacity
- Water stored
- 534.54 hm³
- Total capacity
- 1,089 hm³
- 7-day change
- ▲ 0.6 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 36.152°N, 96.252°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 49.1% | 534.54 |
| 27 Oct 2026 | 49.2% | 536.25 |
| 26 Oct 2026 | 49.7% | 540.98 |
| 25 Oct 2026 | 49.6% | 540.08 |
| 24 Oct 2026 | 49.1% | 534.75 |
| 23 Oct 2026 | 48.5% | 528.4 |
| 22 Oct 2026 | 47.9% | 521.63 |
| 21 Oct 2026 | 48.5% | 527.98 |
| 20 Oct 2026 | 48.4% | 526.92 |
| 19 Oct 2026 | 47.9% | 521.42 |
| 18 Oct 2026 | 46.1% | 502.1 |
| 17 Oct 2026 | 42.9% | 467.66 |