Reservoir · Mississippi · United States · USACE CWMS
John Rankin Lock and Dam
103.9% full
Capacity
30.71 hm³
Volume stored
32 hm³
Vs month average
100% of normal
Coordinates
34.363°N, 88.408°W
Last updated
2026-09-15
Current fill
103.9%vs 7 days ago
0.0%stable
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs September average
100%of normal
103.9% full on 2026-09-15, against an average of 104.1% for September across 2 years of readings (-0.2 points).
Drought Monitor at this site · 13 October 2026
D1moderate drought
The ground at John Rankin Lock and Dam's coordinates falls inside the D1 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Mississippi drought figures →
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: 2026-09-15.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.363, -88.408 · Open in Google Maps
About John Rankin Lock and Dam
As of September 15, 2026, John Rankin Lock and Dam is filled to 103.9% of its total capacity, holding roughly 32 hm³ of water out of a maximum 31 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts).
Across the readings we hold for John Rankin Lock and Dam — 56 data points between October 16, 2021 and September 15, 2026 — the level has ranged from a low of 101.3% (November 4, 2021) to a high of 104.4% (September 13, 2026).
It is operated by USACE primarily for multiple purposes. It lies within the Mississippi basin at 34.363°N, 88.408°W.
Key facts
- Current fill level
- 103.9%
- Water stored
- 32 hm³
- Total capacity
- 31 hm³
- 7-day change
- No change
- Primary use
- Multipurpose
- River basin
- Mississippi
- Operator
- USACE
- Coordinates
- 34.363°N, 88.408°W
- Last updated
- September 15, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 15 Sep 2026 | 103.9% | 32 |
| 14 Sep 2026 | 104.0% | 32 |
| 13 Sep 2026 | 104.4% | 32 |
| 7 Dec 2021 | 102.0% | 31 |
| 6 Dec 2021 | 101.7% | 31 |
| 5 Dec 2021 | 103.3% | 32 |
| 4 Dec 2021 | 102.2% | 31 |
| 3 Dec 2021 | 102.5% | 31 |
| 2 Dec 2021 | 103.2% | 32 |
| 1 Dec 2021 | 102.0% | 31 |
| 30 Nov 2021 | 102.4% | 31 |
| 29 Nov 2021 | 101.8% | 31 |