Reservoir · Oklahoma · United States · USACE CWMS
Wister Lake
42.2% full
Capacity
152.95 hm³
Volume stored
65 hm³
Coordinates
34.936°N, 94.719°W
Last updated
2026-07-30
Current fill
42.2%vs 7 days ago
+1.0%gaining
vs 1 year ago
-49.9%year-over-year
7-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: 2026-07-30.
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 July 30, 2026, Wister Lake is filled to 42.2% of its total capacity, holding roughly 65 hm³ of water out of a maximum 153 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 (+1.0 pts), and it is 49.9 points below its level on the same date a year earlier.
Across the readings we hold for Wister Lake — 330 data points between July 31, 2021 and July 30, 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
- 42.2%
- Water stored
- 65 hm³
- Total capacity
- 153 hm³
- 7-day change
- ▲ 1.0 pts
- Year-on-year
- ▼ 49.9 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 34.936°N, 94.719°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 42.2% | 65 |
| 29 Jul 2026 | 41.2% | 63 |
| 28 Jul 2026 | 41.7% | 64 |
| 27 Jul 2026 | 41.7% | 64 |
| 26 Jul 2026 | 42.0% | 64 |
| 25 Jul 2026 | 42.2% | 65 |
| 24 Jul 2026 | 42.4% | 65 |
| 23 Jul 2026 | 42.5% | 65 |
| 22 Jul 2026 | 42.8% | 65 |
| 21 Jul 2026 | 43.1% | 66 |
| 20 Jul 2026 | 43.3% | 66 |
| 19 Jul 2026 | 43.4% | 66 |
Frequently asked questions
What is the current water level of Wister Lake?
As of July 30, 2026, Wister Lake is at 42.2% of its capacity, holding approximately 65 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Wister Lake reservoir full?
No. As of July 30, 2026, Wister Lake is within its normal operating range at 42.2% of its capacity, so it is not full.
Is the water level at Wister Lake rising or falling?
The level at Wister Lake has been broadly stable over the latest week on record (+1.0 points).
How much water can Wister Lake hold?
Wister Lake has a total capacity of 153 hm³.
Where is Wister Lake reservoir located?
Wister Lake is located in Oklahoma, United States, within the Oklahoma basin (coordinates 34.936°N, 94.719°W).
What is Wister Lake used for?
Wister Lake is used primarily for multiple purposes, and is managed by USACE.