Reservoir · Ohio · United States · USACE CWMS
Tappan Lake
98.4% full
Capacity
43.3 hm³
Volume stored
43 hm³
Vs month average
99% of normal
Coordinates
40.356°N, 81.226°W
Last updated
2026-10-28
Current fill
98.4%vs 7 days ago
-0.4 pplosing
vs 1 year ago
N/A7-day trend
→stable
Drought context
Storage vs October average
99%of normal
98.4% full on 2026-10-28, against an average of 99.4% for October across 2 years of readings (-1.0 points).
Drought Monitor at this site · 20 October 2026
Nonenot in a drought category
Tappan Lake's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Ohio drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.356°N, 81.226°W · Open in Google Maps
About Tappan Lake
As of October 28, 2026, Tappan Lake is filled to 98.4% of its total capacity, holding 42.61 hm³ of water out of a maximum 43.3 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.4 pp).
Across the readings we hold for Tappan Lake — 100 data points between October 29, 2021 and October 28, 2026 — the level has ranged from a low of 61.7% (December 20, 2021) to a high of 103.3% (October 30, 2021).
It is operated by USACE primarily for multiple purposes. It is at 40.356°N, 81.226°W.
Key facts
- Current fill level
- 98.4% of total capacity
- Water stored
- 42.61 hm³
- Total capacity
- 43.3 hm³
- 7-day change
- ▼ 0.4 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 40.356°N, 81.226°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 98.4% | 42.61 |
| 27 Oct 2026 | 98.4% | 42.61 |
| 26 Oct 2026 | 98.5% | 42.64 |
| 25 Oct 2026 | 98.5% | 42.67 |
| 24 Oct 2026 | 98.6% | 42.7 |
| 23 Oct 2026 | 98.7% | 42.73 |
| 22 Oct 2026 | 98.8% | 42.76 |
| 21 Oct 2026 | 98.8% | 42.79 |
| 20 Oct 2026 | 98.9% | 42.82 |
| 19 Oct 2026 | 99.0% | 42.85 |
| 18 Oct 2026 | 99.0% | 42.88 |
| 17 Oct 2026 | 99.0% | 42.88 |