Reservoir · Oklahoma · United States · USACE CWMS
Wister Lake
16.9% full
Capacity
240.93 hm³
Volume stored
41 hm³
Vs month average
90% of normal
Coordinates
34.936°N, 94.719°W
Last updated
2026-10-15
Current fill
16.9%vs 7 days ago
-0.7%losing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
90%of normal
16.9% full on 2026-10-15, against an average of 18.8% for October across 3 years of readings (-1.9 points).
Drought Monitor at this site · 13 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: 2026-10-15.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.936, -94.719 · Open in Google Maps
About Wister Lake
As of October 15, 2026, Wister Lake is filled to 16.9% of its total capacity, holding roughly 41 hm³ of water out of a maximum 241 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 pts).
Across the readings we hold for Wister Lake — 330 data points between October 16, 2021 and October 15, 2026 — the level has ranged from a low of 16.9% (October 14, 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 lies within the Oklahoma basin at 34.936°N, 94.719°W.
Key facts
- Current fill level
- 16.9%
- Water stored
- 41 hm³
- Total capacity
- 241 hm³
- 7-day change
- ▼ 0.7 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 34.936°N, 94.719°W
- Last updated
- October 15, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 15 Oct 2026 | 16.9% | 41 |
| 14 Oct 2026 | 16.9% | 41 |
| 13 Oct 2026 | 17.0% | 41 |
| 12 Oct 2026 | 17.1% | 41 |
| 11 Oct 2026 | 17.2% | 42 |
| 10 Oct 2026 | 17.4% | 42 |
| 9 Oct 2026 | 17.4% | 42 |
| 8 Oct 2026 | 17.6% | 42 |
| 7 Oct 2026 | 17.7% | 43 |
| 6 Oct 2026 | 17.8% | 43 |
| 5 Oct 2026 | 17.9% | 43 |
| 4 Oct 2026 | 18.0% | 43 |