Reservoir · Ohio · United States · USACE CWMS
Michael J Kirwan Reservoir, OH
93.6% full
Capacity
69.94 hm³
Volume stored
66 hm³
Coordinates
41.156°N, 81.081°W
Last updated
2026-07-30
Current fill
93.6%vs 7 days ago
-0.1%losing
vs 1 year ago
-6.7%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. 41.156, -81.081 · Open in Google Maps
About Michael J Kirwan Reservoir, OH
As of July 30, 2026, Michael J Kirwan Reservoir, OH is filled to 93.6% of its total capacity, holding roughly 66 hm³ of water out of a maximum 70 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it is 6.7 points below its level on the same date a year earlier.
Across the readings we hold for Michael J Kirwan Reservoir, OH — 327 data points between July 31, 2021 and July 30, 2026 — the level has ranged from a low of 79.7% (November 24, 2021) to a high of 105.0% (August 14, 2021). On average the reservoir is fullest around April and at its lowest around November.
It is operated by USACE primarily for multiple purposes. It lies within the Ohio basin at 41.156°N, 81.081°W.
Key facts
- Current fill level
- 93.6%
- Water stored
- 66 hm³
- Total capacity
- 70 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 6.7 pts
- Primary use
- Multipurpose
- River basin
- Ohio
- Operator
- USACE
- Coordinates
- 41.156°N, 81.081°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 93.6% | 65 |
| 29 Jul 2026 | 93.7% | 66 |
| 28 Jul 2026 | 94.0% | 66 |
| 27 Jul 2026 | 94.2% | 66 |
| 26 Jul 2026 | 94.5% | 66 |
| 25 Jul 2026 | 94.7% | 66 |
| 24 Jul 2026 | 95.2% | 67 |
| 23 Jul 2026 | 95.3% | 67 |
| 22 Jul 2026 | 95.7% | 67 |
| 21 Jul 2026 | 95.8% | 67 |
| 20 Jul 2026 | 95.8% | 67 |
| 19 Jul 2026 | 96.0% | 67 |
Frequently asked questions
What is the current water level of Michael J Kirwan Reservoir, OH?
As of July 30, 2026, Michael J Kirwan Reservoir, OH is at 93.6% of its capacity, holding approximately 66 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Michael J Kirwan Reservoir, OH reservoir full?
No. As of July 30, 2026, Michael J Kirwan Reservoir, OH is high at 93.6% of its capacity, so it is not full.
Is the water level at Michael J Kirwan Reservoir, OH rising or falling?
The level at Michael J Kirwan Reservoir, OH has been broadly stable over the latest week on record (-0.1 points).
How much water can Michael J Kirwan Reservoir, OH hold?
Michael J Kirwan Reservoir, OH has a total capacity of 70 hm³.
Where is Michael J Kirwan Reservoir, OH reservoir located?
Michael J Kirwan Reservoir, OH is located in Ohio, United States, within the Ohio basin (coordinates 41.156°N, 81.081°W).
What is Michael J Kirwan Reservoir, OH used for?
Michael J Kirwan Reservoir, OH is used primarily for multiple purposes, and is managed by USACE.