Reservoir · Ohio · United States · USACE CWMS
William H. Harsha Lake
96.8% full
Capacity
114.22 hm³
Volume stored
111 hm³
Coordinates
39.022°N, 84.151°W
Last updated
2026-09-10
Current fill
96.8%vs 7 days ago
-0.5%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: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.022, -84.151 · Open in Google Maps
About William H. Harsha Lake
As of September 10, 2026, William H. Harsha Lake is filled to 96.8% of its total capacity, holding roughly 111 hm³ of water out of a maximum 114 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.5 pts).
Across the readings we hold for William H. Harsha Lake — 329 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 88.5% (January 22, 2022) to a high of 105.0% (February 18, 2022). On average the reservoir is fullest around May and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It lies within the Ohio basin at 39.022°N, 84.151°W.
Key facts
- Current fill level
- 96.8%
- Water stored
- 111 hm³
- Total capacity
- 114 hm³
- 7-day change
- ▼ 0.5 pts
- Primary use
- Multipurpose
- River basin
- Ohio
- Operator
- USACE
- Coordinates
- 39.022°N, 84.151°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 96.8% | 111 |
| 9 Sep 2026 | 96.8% | 111 |
| 8 Sep 2026 | 97.0% | 111 |
| 7 Sep 2026 | 97.1% | 111 |
| 6 Sep 2026 | 97.3% | 111 |
| 5 Sep 2026 | 97.2% | 111 |
| 4 Sep 2026 | 97.2% | 111 |
| 3 Sep 2026 | 97.3% | 111 |
| 2 Sep 2026 | 97.4% | 111 |
| 1 Sep 2026 | 97.5% | 111 |
| 31 Aug 2026 | 97.6% | 111 |
| 30 Aug 2026 | 97.6% | 112 |