Reservoir · Tennessee · United States · USACE CWMS
J Percy Priest Dam
81.5% full
Capacity
592.32 hm³
Volume stored
483 hm³
Coordinates
36.149°N, 86.619°W
Last updated
2026-09-11
Current fill
81.5%vs 7 days ago
0.0%stable
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. 36.149, -86.619 · Open in Google Maps
About J Percy Priest Dam
As of September 11, 2026, J Percy Priest Dam is filled to 81.5% of its total capacity, holding roughly 483 hm³ of water out of a maximum 592 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).
Across the readings we hold for J Percy Priest Dam — 330 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 62.3% (February 21, 2022) to a high of 100.0% (February 26, 2022). On average the reservoir is fullest around September and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It lies within the Tennessee basin at 36.149°N, 86.619°W.
Key facts
- Current fill level
- 81.5%
- Water stored
- 483 hm³
- Total capacity
- 592 hm³
- 7-day change
- No change
- Primary use
- Multipurpose
- River basin
- Tennessee
- Operator
- USACE
- Coordinates
- 36.149°N, 86.619°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 81.5% | 482 |
| 10 Sep 2026 | 81.3% | 482 |
| 9 Sep 2026 | 81.5% | 482 |
| 8 Sep 2026 | 81.5% | 483 |
| 7 Sep 2026 | 81.5% | 483 |
| 6 Sep 2026 | 81.5% | 483 |
| 5 Sep 2026 | 81.5% | 483 |
| 4 Sep 2026 | 81.5% | 483 |
| 3 Sep 2026 | 81.5% | 483 |
| 2 Sep 2026 | 81.5% | 483 |
| 1 Sep 2026 | 81.6% | 484 |
| 31 Aug 2026 | 81.7% | 484 |