Reservoir · Tennessee · United States · USACE CWMS
J Percy Priest Dam
85.2% full
Capacity
581.92 hm³
Volume stored
496 hm³
Coordinates
36.149°N, 86.619°W
Last updated
2026-07-30
Current fill
85.2%vs 7 days ago
+0.1%gaining
vs 1 year ago
+7.7%year-over-year
7-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: 2026-07-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.149, -86.619 · Open in Google Maps
About J Percy Priest Dam
As of July 30, 2026, J Percy Priest Dam is filled to 85.2% of its total capacity, holding roughly 496 hm³ of water out of a maximum 582 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.1 pts), and it is 7.7 points above its level on the same date a year earlier.
Across the readings we hold for J Percy Priest Dam — 330 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 63.4% (February 21, 2022) to a high of 100.0% (September 22, 2021). On average the reservoir is fullest around September and at its lowest around February.
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
- 85.2%
- Water stored
- 496 hm³
- Total capacity
- 582 hm³
- 7-day change
- ▲ 0.1 pts
- Year-on-year
- ▲ 7.7 pts
- Primary use
- Multipurpose
- River basin
- Tennessee
- Operator
- USACE
- Coordinates
- 36.149°N, 86.619°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 85.2% | 496 |
| 29 Jul 2026 | 85.1% | 495 |
| 28 Jul 2026 | 85.3% | 496 |
| 27 Jul 2026 | 85.2% | 496 |
| 26 Jul 2026 | 85.3% | 496 |
| 25 Jul 2026 | 85.4% | 497 |
| 24 Jul 2026 | 85.3% | 497 |
| 23 Jul 2026 | 86.2% | 501 |
| 22 Jul 2026 | 87.5% | 509 |
| 21 Jul 2026 | 85.7% | 499 |
| 20 Jul 2026 | 85.8% | 499 |
| 19 Jul 2026 | 85.8% | 499 |
Frequently asked questions
What is the current water level of J Percy Priest Dam?
As of July 30, 2026, J Percy Priest Dam is at 85.2% of its capacity, holding approximately 496 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is J Percy Priest Dam reservoir full?
No. As of July 30, 2026, J Percy Priest Dam is high at 85.2% of its capacity, so it is not full.
Is the water level at J Percy Priest Dam rising or falling?
The level at J Percy Priest Dam has been broadly stable over the latest week on record (+0.1 points).
How much water can J Percy Priest Dam hold?
J Percy Priest Dam has a total capacity of 582 hm³.
Where is J Percy Priest Dam reservoir located?
J Percy Priest Dam is located in Tennessee, United States, within the Tennessee basin (coordinates 36.149°N, 86.619°W).
What is J Percy Priest Dam used for?
J Percy Priest Dam is used primarily for multiple purposes, and is managed by USACE.