Reservoir · Ohio · United States · USACE CWMS
Delaware Lake
66.2% full
Capacity
27.42 hm³
Volume stored
18 hm³
Coordinates
40.359°N, 83.069°W
Last updated
2026-09-11
Current fill
66.2%vs 7 days ago
+1.6%gaining
vs 1 year ago
N/A7-day trend
↑rising
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: 2026-09-11.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.359, -83.069 · Open in Google Maps
About Delaware Lake
As of September 11, 2026, Delaware Lake is filled to 66.2% of its total capacity, holding roughly 18 hm³ of water out of a maximum 27 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 1.6 percentage points.
Across the readings we hold for Delaware Lake — 47 data points between July 27, 2026 and September 11, 2026 — the level has ranged from a low of 63.5% (August 9, 2026) to a high of 100.0% (August 18, 2026).
It is operated by USACE primarily for multiple purposes. It lies within the Ohio basin at 40.359°N, 83.069°W.
Key facts
- Current fill level
- 66.2%
- Water stored
- 18 hm³
- Total capacity
- 27 hm³
- 7-day change
- ▲ 1.6 pts
- Primary use
- Multipurpose
- River basin
- Ohio
- Operator
- USACE
- Coordinates
- 40.359°N, 83.069°W
- Last updated
- September 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Sep 2026 | 66.2% | 18 |
| 10 Sep 2026 | 66.3% | 18 |
| 9 Sep 2026 | 66.6% | 18 |
| 8 Sep 2026 | 66.9% | 18 |
| 7 Sep 2026 | 66.8% | 18 |
| 6 Sep 2026 | 66.0% | 18 |
| 5 Sep 2026 | 65.3% | 18 |
| 4 Sep 2026 | 64.6% | 18 |
| 3 Sep 2026 | 64.7% | 18 |
| 2 Sep 2026 | 64.6% | 18 |
| 1 Sep 2026 | 64.7% | 18 |
| 31 Aug 2026 | 64.6% | 18 |