Reservoir · Tennessee · United States · USACE CWMS
Old Hickory Lock and Dam
100.3% full
Capacity
518.06 hm³
Volume stored
520 hm³
Coordinates
36.294°N, 86.657°W
Last updated
2026-07-30
Current fill
100.3%vs 7 days ago
+1.2%gaining
vs 1 year ago
+0.2%year-over-year
7-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: 2026-07-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 36.294, -86.657 · Open in Google Maps
About Old Hickory Lock and Dam
As of July 30, 2026, Old Hickory Lock and Dam is filled to 100.3% of its total capacity, holding roughly 520 hm³ of water out of a maximum 518 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+1.2 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Old Hickory Lock and Dam — 328 data points between July 31, 2021 and July 30, 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 September.
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
- 100.3%
- Water stored
- 520 hm³
- Total capacity
- 518 hm³
- 7-day change
- ▲ 1.2 pts
- Year-on-year
- ▲ 0.2 pts
- Primary use
- Multipurpose
- River basin
- Tennessee
- Operator
- USACE
- Coordinates
- 36.294°N, 86.657°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 100.3% | 520 |
| 29 Jul 2026 | 99.1% | 514 |
| 28 Jul 2026 | 98.6% | 511 |
| 27 Jul 2026 | 98.1% | 508 |
| 26 Jul 2026 | 97.8% | 507 |
| 25 Jul 2026 | 96.9% | 502 |
| 24 Jul 2026 | 96.6% | 500 |
| 23 Jul 2026 | 97.2% | 503 |
| 22 Jul 2026 | 99.0% | 513 |
| 21 Jul 2026 | 99.7% | 516 |
| 20 Jul 2026 | 99.6% | 516 |
| 19 Jul 2026 | 99.8% | 517 |
Frequently asked questions
What is the current water level of Old Hickory Lock and Dam?
As of July 30, 2026, Old Hickory Lock and Dam is at 100.3% of its capacity, holding approximately 520 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Old Hickory Lock and Dam reservoir full?
Old Hickory Lock and Dam is essentially full, sitting at 100.3% of capacity as of July 30, 2026.
Is the water level at Old Hickory Lock and Dam rising or falling?
The level at Old Hickory Lock and Dam has been broadly stable over the latest week on record (+1.2 points).
How much water can Old Hickory Lock and Dam hold?
Old Hickory Lock and Dam has a total capacity of 518 hm³.
Where is Old Hickory Lock and Dam reservoir located?
Old Hickory Lock and Dam is located in Tennessee, United States, within the Tennessee basin (coordinates 36.294°N, 86.657°W).
What is Old Hickory Lock and Dam used for?
Old Hickory Lock and Dam is used primarily for multiple purposes, and is managed by USACE.