Reservoir · Oklahoma · United States · USACE CWMS
Ft. Supply Lake
95.3% full
Capacity
17.15 hm³
Volume stored
16 hm³
Coordinates
36.554°N, 99.571°W
Last updated
2026-06-11
Current fill
95.3%vs 7 days ago
-0.3%losing
vs 1 year ago
+0.4%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: 2026-06-11.
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 June 11, 2026, Ft. Supply Lake is filled to 95.3% of its total capacity, holding roughly 16 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 (-0.3 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Ft. Supply Lake — 329 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 87.9% (October 10, 2021) to a high of 100.4% (March 9, 2026). On average the reservoir is fullest around January 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
- 95.3%
- Water stored
- 16 hm³
- Total capacity
- 17 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▲ 0.4 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.554°N, 99.571°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 95.3% | 16 |
| 10 Jun 2026 | 95.6% | 16 |
| 9 Jun 2026 | 95.6% | 16 |
| 8 Jun 2026 | 95.6% | 16 |
| 7 Jun 2026 | 95.6% | 16 |
| 6 Jun 2026 | 95.6% | 16 |
| 5 Jun 2026 | 95.8% | 16 |
| 4 Jun 2026 | 95.8% | 16 |
| 3 Jun 2026 | 94.9% | 16 |
| 2 Jun 2026 | 94.9% | 16 |
| 1 Jun 2026 | 95.3% | 16 |
| 31 May 2026 | 95.5% | 16 |
Frequently asked questions
What is the current water level of Ft. Supply Lake?
As of June 11, 2026, Ft. Supply Lake is at 95.3% of its capacity, holding approximately 16 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Ft. Supply Lake reservoir full?
Ft. Supply Lake is essentially full, sitting at 95.3% of capacity as of June 11, 2026.
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 (-0.3 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.