Reservoir · Oklahoma · United States · USACE CWMS
Ft. Supply Lake
89.2% full
Capacity
17.15 hm³
Volume stored
15 hm³
Coordinates
36.554°N, 99.571°W
Last updated
2026-07-30
Current fill
89.2%vs 7 days ago
0.0%stable
vs 1 year ago
-6.4%year-over-year
7-day trend
→stable
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: 2026-07-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.554, -99.571 · Open in Google Maps
About Ft. Supply Lake
As of July 30, 2026, Ft. Supply Lake is filled to 89.2% of its total capacity, holding roughly 15 hm³ of water out of a maximum 17 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 6.4 points below its level on the same date a year earlier.
Across the readings we hold for Ft. Supply Lake — 329 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 87.9% (October 10, 2021) to a high of 104.4% (January 31, 2022). On average the reservoir is fullest around February and at its lowest around October.
It is operated by USACE primarily for multiple purposes. It lies within the Oklahoma basin at 36.554°N, 99.571°W.
Key facts
- Current fill level
- 89.2%
- Water stored
- 15 hm³
- Total capacity
- 17 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 6.4 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.554°N, 99.571°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 89.2% | 15 |
| 29 Jul 2026 | 89.2% | 15 |
| 28 Jul 2026 | 89.7% | 15 |
| 27 Jul 2026 | 90.2% | 15 |
| 26 Jul 2026 | 90.5% | 16 |
| 25 Jul 2026 | 90.8% | 16 |
| 24 Jul 2026 | 91.1% | 16 |
| 23 Jul 2026 | 91.2% | 16 |
| 22 Jul 2026 | 91.5% | 16 |
| 21 Jul 2026 | 91.9% | 16 |
| 20 Jul 2026 | 92.2% | 16 |
| 19 Jul 2026 | 92.5% | 16 |
Frequently asked questions
What is the current water level of Ft. Supply Lake?
As of July 30, 2026, Ft. Supply Lake is at 89.2% of its capacity, holding approximately 15 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Ft. Supply Lake reservoir full?
No. As of July 30, 2026, Ft. Supply Lake is high at 89.2% of its capacity, so it is not full.
Is the water level at Ft. Supply Lake rising or falling?
The level at Ft. Supply Lake has been broadly stable over the latest week on record (0.0 points).
How much water can Ft. Supply Lake hold?
Ft. Supply Lake has a total capacity of 17 hm³.
Where is Ft. Supply Lake reservoir located?
Ft. Supply Lake is located in Oklahoma, United States, within the Oklahoma basin (coordinates 36.554°N, 99.571°W).
What is Ft. Supply Lake used for?
Ft. Supply Lake is used primarily for multiple purposes, and is managed by USACE.