Lakes / Ohio / Delphos Gillmor Reservoir
Delphos Gillmor Reservoir, Ohio
49 acres
Surface Area
33 ft
Max Depth
1.13 mi
Shoreline
777 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Ohio
40.88 degrees N, 84.36 degrees W - Putnam County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Ohio DNR coordinates, not by eye. Schematic - not a survey map.
Depth Profile - Delphos Gillmor Reservoir
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map.
How Delphos Gillmor Reservoir Stacks Up
- The largest lake in Putnam County among those counted.
- About 69 miles from Toledo, as the crow flies.
Facts and Figures
Waterbody IDoh-delphos-gillmor-reservoir-39137
CountyPutnam
Shoreline1.13 mi
Coordinates40.8793, -84.3644
Deepest Natural Lakes in Ohio
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | McKarns Lake | Williams | 40 acres | 75 ft |
| 2 | Portage Lakes | Summit | 474 acres | 60 ft |
| 3 | Punderson Lake | Geauga | 80 acres | 55 ft |
| 4 | Wolf Run Lake | Noble | 208 acres | 51 ft |
| 5 | Barton Lake | Williams | 19 acres | 42 ft |
Largest Lakes in Ohio
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Grand Lake St. Marys | Mercer | 13,356 acres | 14 ft |
| 2 | Mosquito Creek Lake | Trumbull | 7,212 acres | 24 ft |
| 3 | Indian Lake | Logan | 5,161 acres | 12 ft |
| 4 | Seneca Lake | Noble | 3,550 acres | 21 ft |
| 5 | Berlin Lake | Portage | 3,344 acres | 60 ft |
Sources: Ohio Department of Natural Resources lake data (ID oh-delphos-gillmor-reservoir-39137); USGS. Verified October 28, 2026.