Reservoir · Oklahoma · United States · USACE CWMS
Great Salt Plains Lake
63.3% full
Capacity
38.76 hm³
Volume stored
25 hm³
Coordinates
36.744°N, 98.136°W
Last updated
2026-09-11
Current fill
63.3%vs 7 days ago
-1.8%losing
vs 1 year ago
N/A7-day trend
↓falling
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. 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. 36.744, -98.136 · Open in Google Maps
About Great Salt Plains Lake
As of September 11, 2026, Great Salt Plains Lake is filled to 63.3% of its total capacity, holding roughly 25 hm³ of water out of a maximum 39 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 1.8 percentage points.
Across the readings we hold for Great Salt Plains Lake — 329 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 59.4% (September 10, 2026) to a high of 105.0% (April 6, 2022). On average the reservoir is fullest around October and at its lowest around August.
It is operated by USACE primarily for multiple purposes. It lies within the Oklahoma basin at 36.744°N, 98.136°W.
Key facts
- Current fill level
- 63.3%
- Water stored
- 25 hm³
- Total capacity
- 39 hm³
- 7-day change
- ▼ 1.8 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.744°N, 98.136°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 63.3% | 25 |
| 10 Sep 2026 | 59.4% | 23 |
| 9 Sep 2026 | 64.1% | 25 |
| 8 Sep 2026 | 65.6% | 25 |
| 7 Sep 2026 | 64.6% | 25 |
| 6 Sep 2026 | 65.8% | 26 |
| 5 Sep 2026 | 63.8% | 25 |
| 4 Sep 2026 | 65.1% | 25 |
| 3 Sep 2026 | 64.6% | 25 |
| 2 Sep 2026 | 66.8% | 26 |
| 1 Sep 2026 | 67.5% | 26 |
| 31 Aug 2026 | 69.3% | 27 |