Reservoir · Oklahoma · United States · USACE CWMS
W.D. Mayo LD14
96.6% full
Capacity
43.73 hm³
Volume stored
42 hm³
Coordinates
35.315°N, 94.560°W
Last updated
2026-09-11
Current fill
96.6%vs 7 days ago
+0.8%gaining
vs 1 year ago
N/A7-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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 35.315, -94.560 · Open in Google Maps
About W.D. Mayo LD14
As of September 11, 2026, W.D. Mayo LD14 is filled to 96.6% of its total capacity, holding roughly 42 hm³ of water out of a maximum 44 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.8 pts).
Across the readings we hold for W.D. Mayo LD14 — 330 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 37.7% (January 24, 2022) to a high of 100.0% (July 4, 2026). On average the reservoir is fullest around May and at its lowest around April.
It is operated by USACE primarily for multiple purposes. It lies within the Oklahoma basin at 35.315°N, 94.560°W.
Key facts
- Current fill level
- 96.6%
- Water stored
- 42 hm³
- Total capacity
- 44 hm³
- 7-day change
- ▲ 0.8 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 35.315°N, 94.560°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 96.6% | 42 |
| 10 Sep 2026 | 97.5% | 43 |
| 9 Sep 2026 | 96.7% | 42 |
| 8 Sep 2026 | 99.2% | 43 |
| 7 Sep 2026 | 96.6% | 42 |
| 6 Sep 2026 | 99.4% | 43 |
| 5 Sep 2026 | 98.1% | 43 |
| 4 Sep 2026 | 95.8% | 42 |
| 3 Sep 2026 | 99.0% | 43 |
| 2 Sep 2026 | 99.4% | 43 |
| 1 Sep 2026 | 99.5% | 44 |
| 31 Aug 2026 | 96.9% | 42 |