Reservoir · Ohio · United States · USACE CWMS
Charles Mill Lake
102.1% full
Capacity
9.13 hm³
Volume stored
9 hm³
Coordinates
40.740°N, 82.362°W
Last updated
2026-07-30
Current fill
102.1%vs 7 days ago
-0.9%losing
vs 1 year ago
-1.8%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. 40.740, -82.362 · Open in Google Maps
About Charles Mill Lake
As of July 30, 2026, Charles Mill Lake is filled to 102.1% of its total capacity, holding roughly 9 hm³ of water out of a maximum 9 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (-0.9 pts), and it is 1.8 points below its level on the same date a year earlier.
Across the readings we hold for Charles Mill Lake — 100 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 102.1% (July 30, 2026) to a high of 105.0% (July 31, 2021).
It is operated by USACE primarily for multiple purposes. It lies within the Ohio basin at 40.740°N, 82.362°W.
Key facts
- Current fill level
- 102.1%
- Water stored
- 9 hm³
- Total capacity
- 9 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 1.8 pts
- Primary use
- Multipurpose
- River basin
- Ohio
- Operator
- USACE
- Coordinates
- 40.740°N, 82.362°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 102.1% | 9 |
| 29 Jul 2026 | 103.0% | 9 |
| 28 Jul 2026 | 103.9% | 9 |
| 27 Jul 2026 | 103.4% | 9 |
| 26 Jul 2026 | 103.7% | 9 |
| 25 Jul 2026 | 103.7% | 9 |
| 24 Jul 2026 | 104.3% | 10 |
| 23 Jul 2026 | 104.2% | 10 |
| 22 Jul 2026 | 104.2% | 10 |
| 21 Jul 2026 | 104.9% | 10 |
| 20 Jul 2026 | 104.3% | 10 |
| 19 Jul 2026 | 105.0% | 10 |
Frequently asked questions
What is the current water level of Charles Mill Lake?
As of July 30, 2026, Charles Mill Lake is at 102.1% of its capacity, holding approximately 9 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Charles Mill Lake reservoir full?
Charles Mill Lake is essentially full, sitting at 102.1% of capacity as of July 30, 2026.
Is the water level at Charles Mill Lake rising or falling?
The level at Charles Mill Lake has been broadly stable over the latest week on record (-0.9 points).
How much water can Charles Mill Lake hold?
Charles Mill Lake has a total capacity of 9 hm³.
Where is Charles Mill Lake reservoir located?
Charles Mill Lake is located in Ohio, United States, within the Ohio basin (coordinates 40.740°N, 82.362°W).
What is Charles Mill Lake used for?
Charles Mill Lake is used primarily for multiple purposes, and is managed by USACE.