Reservoir · Oklahoma · United States · USACE CWMS
Fort Supply Lake
83.7% full
Capacity
17.15 hm³
Volume stored
14 hm³
Coordinates
36.554°N, 99.571°W
Last updated
2026-08-14
Current fill
83.7%vs 7 days ago
-2.4%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: 2026-08-14.
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 Fort Supply Lake
As of August 14, 2026, Fort Supply Lake is filled to 83.7% of its total capacity, holding roughly 14 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 fallen by 2.4 percentage points.
Across the readings we hold for Fort Supply Lake — 329 data points between August 15, 2021 and August 14, 2026 — the level has ranged from a low of 83.7% (August 13, 2026) to a high of 104.4% (January 31, 2022). 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
- 83.7%
- Water stored
- 14 hm³
- Total capacity
- 17 hm³
- 7-day change
- ▼ 2.4 pts
- Primary use
- Multipurpose
- River basin
- Oklahoma
- Operator
- USACE
- Coordinates
- 36.554°N, 99.571°W
- Last updated
- August 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Aug 2026 | 83.7% | 14 |
| 13 Aug 2026 | 83.7% | 14 |
| 12 Aug 2026 | 84.2% | 14 |
| 11 Aug 2026 | 84.5% | 15 |
| 10 Aug 2026 | 85.0% | 15 |
| 9 Aug 2026 | 85.4% | 15 |
| 8 Aug 2026 | 85.8% | 15 |
| 7 Aug 2026 | 86.1% | 15 |
| 6 Aug 2026 | 86.4% | 15 |
| 5 Aug 2026 | 86.6% | 15 |
| 4 Aug 2026 | 87.1% | 15 |
| 3 Aug 2026 | 87.4% | 15 |
Frequently asked questions
What is the current water level of Fort Supply Lake?
As of August 14, 2026, Fort Supply Lake is at 83.7% of its capacity, holding approximately 14 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Fort Supply Lake reservoir full?
No. As of August 14, 2026, Fort Supply Lake is high at 83.7% of its capacity, so it is not full.
Is the water level at Fort Supply Lake rising or falling?
The level at Fort Supply Lake is falling — it dropped 2.4 percentage points over the latest week on record.
How much water can Fort Supply Lake hold?
Fort Supply Lake has a total capacity of 17 hm³.
Where is Fort Supply Lake reservoir located?
Fort Supply Lake is located in Oklahoma, United States, within the Oklahoma basin (coordinates 36.554°N, 99.571°W).
What is Fort Supply Lake used for?
Fort Supply Lake is used primarily for multiple purposes, and is managed by USACE.