Reservoir · Oklahoma · United States · USACE CWMS
Wister Lake
32.0% full
Capacity
152.95 hm³
Volume stored
49 hm³
Coordinates
34.936°N, 94.719°W
Last updated
2026-09-11
Current fill
32.0%vs 7 days ago
-1.6%losing
vs 1 year ago
N/A7-day trend
↓falling
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. 34.936, -94.719 · Open in Google Maps
About Wister Lake
As of September 11, 2026, Wister Lake is filled to 32.0% of its total capacity, holding roughly 49 hm³ of water out of a maximum 153 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 1.6 percentage points.
Across the readings we hold for Wister Lake — 330 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 28.3% (October 11, 2021) to a high of 100.0% (June 15, 2026). On average the reservoir is fullest around June 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
- 32.0%
- Water stored
- 49 hm³
- Total capacity
- 153 hm³
- 7-day change
- ▼ 1.6 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 34.936°N, 94.719°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 32.0% | 49 |
| 10 Sep 2026 | 32.1% | 49 |
| 9 Sep 2026 | 32.3% | 49 |
| 8 Sep 2026 | 32.7% | 50 |
| 7 Sep 2026 | 32.8% | 50 |
| 6 Sep 2026 | 33.2% | 51 |
| 5 Sep 2026 | 33.4% | 51 |
| 4 Sep 2026 | 33.6% | 51 |
| 3 Sep 2026 | 33.7% | 52 |
| 2 Sep 2026 | 34.1% | 52 |
| 1 Sep 2026 | 34.3% | 53 |
| 31 Aug 2026 | 34.5% | 53 |