O12
Grand Lake St Marys Seaplane Base
St Marys, OhioElevation 871 ftSeaplane base
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Runway detail & declared distances
09W/27W
RWY 09W
RWY 27W
Traffic patternRight
Runway data from the FAA NASR dataset (effective 2026-06-11). Verify with the current Chart Supplement and NOTAMs.
AIRPORT INFORMATION
Facility & services
Grand Lake St Marys Seaplane Base is in St Marys, Ohio. Field elevation 871 ft MSL. Airport facts are drawn from OurAirports and the FAA NASR dataset.
OPERATIONS & CONTACT
OwnershipPublicly owned
UseOpen to the public
TypeSeaplane base
ManagerDAVID FALER, ASST PARK MGR
Manager phone419-394-3611
AttendedAPR-NOV ALL, 0800–1700
CHARTS & AIRSPACE
ICAO / IATAO12
SectionalDETROIT
Center (ARTCC)INDIANAPOLIS
Flight service (AFSS)DAYTON
RegionOhio
CountryUnited States
Coordinates40.5410, -84.4907
Distance from city5 NM NE
SERVICES & LIGHTING
Fuel100LL
Control towerNon-towered
CTAF122.900
FREQUENCIES
Communications
122.900
CTAF
CTAF
Not all tower/ground/approach frequencies are in our datasets. Verify with the FAA Chart Supplement.
AIRPORT REMARKS
Operational remarks
›PRVDD 20:1 APCH; OIL WELL TO THE S MKD & LGTD; SEA LANES MKD & LGTD PER AC 150/5395-1.
›NO NGT OPS.
›NO PUB DOCKS; PPR FOR PVT DOCK TIE UP; CALL KOZY MARINA 419-394-8797.
›FOR CD CTC COLUMBUS APCH AT 614-338-8537.
›CELL 419-656-7060.
›ARPT CLSD NOV 15 TO APR 1 & MEMORIAL & LABOR DAY.
›100LL AVBL ON REQ, PPR, CTC KOZY MARINA 419-394-8797.
›ACFT OPRG AT GRAND LAKE ST MARYS SHOULD MNT TFC ON LAKEFIELD CTAF & NEIL ARMSTRONG CTAF.
FREQUENTLY ASKED
Does O12 have a METAR?
No on-field METAR is issued for O12. This page uses the nearest reporting station as a reference.
Does O12 have a TAF?
No TAF is issued directly for O12. Use the nearest TAF-issuing field as a planning reference.
What is the field elevation at O12?
O12 sits at 871 ft MSL, which factors into the density-altitude estimate on this page.
Is this an official preflight weather briefing for O12?
No. wxdecoder.com is for education and situational awareness only. It is not an official weather briefing or a substitute for official sources, NOTAM review, and pilot judgment.
This app is for aviation weather education, training, and situational awareness only. It is not a substitute for an official weather briefing, approved flight-planning software, flight service, dispatch procedures, current FAA regulations, or pilot judgment. Always verify weather with official sources before flight.