| Grand Lake St. Marys Seaplane Base | |
| Faa: | O12 |
| Type: | Public |
| Owner: | Ohio Division of Parks & Recreation |
| City-Served: | St. Marys, Ohio |
| Location: | Auglaize County, Ohio |
| Elevation-F: | 871 |
| Elevation-M: | 265 |
| Coordinates: | 40.5411°N -84.4906°W |
| R1-Number: | 9/27 |
| R1-Length-F: | 7,000 |
| R1-Length-M: | 2,134 |
| R1-Surface: | Water |
| Footnotes: | Source: Federal Aviation Administration[1] |
| Utc: | -5 |
| Utcs: | -4 |
| Stat1-Header: | Aircraft Movements |
| Stat1-Data: | 12 |
| Stat-Year: | 2022 |
Grand Lake St. Marys Seaplane Base is a public use seaplane base located five nautical miles (9 km) southwest of the central business district of St. Marys, a city in Auglaize County, Ohio, United States. It is owned by the Ohio Division of Parks & Recreation and is located on Grand Lake St. Marys, a lake and state park in Ohio. The airport is a significant meeting place for the Ohio Seaplane Pilots Association.[2]
Grand Lake St. Marys Seaplane Base covers an area of 643acres at an elevation of 871 feet (265 m) above mean sea level. It has one seaplane landing area designated 9/27 and measuring 7,000 x 4,000 ft (2,134 x 1,219 m). For the 12-month period ending September 27, 2022, the airport has 12 aircraft operations per year, all general aviation.[3]
The airport does not have a fixed-base operator, though avgas is available.[4]