Lakes in Putnam County, Ohio
2 lakes counted in Putnam County - the largest is Delphos Gillmor Reservoir at 49 acres.
2
Lakes Counted
49 acres
Largest - Delphos Gillmor Reservoir
33 ft
Deepest - Delphos Gillmor Reservoir
Putnam County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Delphos Gillmor Reservoir | Putnam | 49 acres | 33 ft |
| 2 | Ottawa Reservoir | Putnam | 19 acres | 21 ft |
Sources: Ohio DNR lake data; USGS. Verified October 28, 2026.