Reservoir · Ohio · United States · USACE CWMS
William H. Harsha Lake
99.0% full
Capacity
114.22 hm³
Volume stored
113 hm³
Coordinates
39.022°N, 84.151°W
Last updated
2026-07-29
Current fill
99.0%vs 7 days ago
0.0%stable
vs 1 year ago
+1.5%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: 2026-07-29.
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 July 29, 2026, William H. Harsha Lake is filled to 99.0% of its total capacity, holding roughly 113 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 (+0.0 pts), and it is 1.5 points above its level on the same date a year earlier.
Across the readings we hold for William H. Harsha Lake — 327 data points between July 31, 2021 and July 29, 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 July 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
- 99.0%
- Water stored
- 113 hm³
- Total capacity
- 114 hm³
- 7-day change
- No change
- Year-on-year
- ▲ 1.5 pts
- Primary use
- Multipurpose
- River basin
- Ohio
- Operator
- USACE
- Coordinates
- 39.022°N, 84.151°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 99.0% | 113 |
| 28 Jul 2026 | 99.0% | 113 |
| 27 Jul 2026 | 99.1% | 113 |
| 26 Jul 2026 | 99.1% | 113 |
| 25 Jul 2026 | 99.2% | 113 |
| 24 Jul 2026 | 99.2% | 113 |
| 23 Jul 2026 | 100.2% | 114 |
| 22 Jul 2026 | 102.0% | 116 |
| 21 Jul 2026 | 100.9% | 115 |
| 20 Jul 2026 | 99.6% | 114 |
| 19 Jul 2026 | 99.4% | 114 |
| 18 Jul 2026 | 99.0% | 113 |
Frequently asked questions
What is the current water level of William H. Harsha Lake?
As of July 29, 2026, William H. Harsha Lake is at 99.0% of its capacity, holding approximately 113 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is William H. Harsha Lake reservoir full?
William H. Harsha Lake is essentially full, sitting at 99.0% of capacity as of July 29, 2026.
Is the water level at William H. Harsha Lake rising or falling?
The level at William H. Harsha Lake has been broadly stable over the latest week on record (0.0 points).
How much water can William H. Harsha Lake hold?
William H. Harsha Lake has a total capacity of 114 hm³.
Where is William H. Harsha Lake reservoir located?
William H. Harsha Lake is located in Ohio, United States, within the Ohio basin (coordinates 39.022°N, 84.151°W).
What is William H. Harsha Lake used for?
William H. Harsha Lake is used primarily for multiple purposes, and is managed by USACE.