Reservoir · Tennessee · United States · USACE CWMS
Old Hickory Lock and Dam
98.6% full
Capacity
518.06 hm³
Volume stored
511 hm³
Coordinates
36.294°N, 86.657°W
Last updated
2026-09-11
Current fill
98.6%vs 7 days ago
-1.3%losing
vs 1 year ago
N/A7-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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.294, -86.657 · Open in Google Maps
About Old Hickory Lock and Dam
As of September 11, 2026, Old Hickory Lock and Dam is filled to 98.6% of its total capacity, holding roughly 511 hm³ of water out of a maximum 518 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-1.3 pts).
Across the readings we hold for Old Hickory Lock and Dam — 328 data points between September 12, 2021 and September 11, 2026 — the level has ranged from a low of 91.7% (September 24, 2021) to a high of 105.0% (December 12, 2021). On average the reservoir is fullest around January and at its lowest around March.
It is operated by USACE primarily for multiple purposes. It lies within the Tennessee basin at 36.294°N, 86.657°W.
Key facts
- Current fill level
- 98.6%
- Water stored
- 511 hm³
- Total capacity
- 518 hm³
- 7-day change
- ▼ 1.3 pts
- Primary use
- Multipurpose
- River basin
- Tennessee
- Operator
- USACE
- Coordinates
- 36.294°N, 86.657°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 98.6% | 511 |
| 10 Sep 2026 | 97.2% | 504 |
| 9 Sep 2026 | 97.2% | 504 |
| 8 Sep 2026 | 96.5% | 500 |
| 7 Sep 2026 | 99.3% | 514 |
| 6 Sep 2026 | 99.2% | 514 |
| 5 Sep 2026 | 99.6% | 516 |
| 4 Sep 2026 | 99.9% | 517 |
| 3 Sep 2026 | 100.2% | 519 |
| 2 Sep 2026 | 101.1% | 524 |
| 1 Sep 2026 | 100.9% | 522 |
| 31 Aug 2026 | 100.8% | 522 |