Reservoir · Oklahoma · United States · USACE CWMS
Wister Lake
15.4% full
Capacity
240.93 hm³
Volume stored
37 hm³
Vs month average
90% of normal
Coordinates
34.936°N, 94.719°W
Last updated
2026-10-28
Current fill
15.4%vs 7 days ago
-0.7 pplosing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
90%of normal
15.4% full on 2026-10-28, against an average of 17.2% for October across 2 years of readings (-1.8 points).
Drought Monitor at this site · 20 October 2026
D2severe drought
The ground at Wister Lake's coordinates falls inside the D2 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. 34.936°N, 94.719°W · Open in Google Maps
About Wister Lake
As of October 28, 2026, Wister Lake is filled to 15.4% of its total capacity, holding 37 hm³ of water out of a maximum 240.93 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.7 pp).
Across the readings we hold for Wister Lake — 330 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 15.4% (October 27, 2026) to a high of 100.0% (May 8, 2022). On average the reservoir is fullest around May and at its lowest around October.
It is operated by USACE primarily for multiple purposes. It is at 34.936°N, 94.719°W.
Key facts
- Current fill level
- 15.4% of total capacity
- Water stored
- 37 hm³
- Total capacity
- 240.93 hm³
- 7-day change
- ▼ 0.7 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 34.936°N, 94.719°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 15.4% | 37 |
| 27 Oct 2026 | 15.4% | 37.12 |
| 26 Oct 2026 | 15.5% | 37.41 |
| 25 Oct 2026 | 15.7% | 37.71 |
| 24 Oct 2026 | 15.7% | 37.83 |
| 23 Oct 2026 | 15.8% | 38.12 |
| 22 Oct 2026 | 16.0% | 38.47 |
| 21 Oct 2026 | 16.1% | 38.71 |
| 20 Oct 2026 | 16.2% | 39 |
| 19 Oct 2026 | 16.3% | 39.3 |
| 18 Oct 2026 | 16.4% | 39.53 |
| 17 Oct 2026 | 16.5% | 39.83 |