Reservoir · Tennessee · United States · USACE CWMS
J Percy Priest Dam
79.2% full
Capacity
592.32 hm³
Volume stored
469 hm³
Vs month average
99% of normal
Coordinates
36.149°N, 86.619°W
Last updated
2026-10-28
Current fill
79.2%vs 7 days ago
-0.3 pplosing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
99%of normal
79.2% full on 2026-10-28, against an average of 79.7% for October across 2 years of readings (-0.5 points).
Drought Monitor at this site · 20 October 2026
D2severe drought
The ground at J Percy Priest Dam's coordinates falls inside the D2 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Tennessee drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.149°N, 86.619°W · Open in Google Maps
About J Percy Priest Dam
As of October 28, 2026, J Percy Priest Dam is filled to 79.2% of its total capacity, holding 469.25 hm³ of water out of a maximum 592.32 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.3 pp).
Across the readings we hold for J Percy Priest Dam — 330 data points between October 29, 2021 and October 28, 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 August and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It is at 36.149°N, 86.619°W.
Key facts
- Current fill level
- 79.2% of total capacity
- Water stored
- 469.25 hm³
- Total capacity
- 592.32 hm³
- 7-day change
- ▼ 0.3 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 36.149°N, 86.619°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 79.2% | 469.25 |
| 27 Oct 2026 | 79.2% | 468.9 |
| 26 Oct 2026 | 79.2% | 468.9 |
| 25 Oct 2026 | 79.2% | 469.25 |
| 24 Oct 2026 | 79.3% | 469.94 |
| 23 Oct 2026 | 79.4% | 470.45 |
| 22 Oct 2026 | 79.5% | 470.62 |
| 21 Oct 2026 | 79.5% | 470.62 |
| 20 Oct 2026 | 79.5% | 470.62 |
| 19 Oct 2026 | 79.5% | 470.97 |
| 18 Oct 2026 | 79.6% | 471.31 |
| 17 Oct 2026 | 79.7% | 472.17 |