1
Runway
1
Frequency
0
Procedures
1
NOTAM
Quick Facts
FAA
O12
Elevation
871 ft MSL
Runways
1
Frequencies
1
Tower
No
Fuel
100LL
Coordinates
40.541, -84.491
Airport Information
Facility Type
SEAPLANE BASE
Elevation
871 ft MSL
Control Tower
No
Fuel Types
100LL
ARTCC
INDIANAPOLIS
Coordinates
40.5410, -84.4907
Ownership
Public
Hours of Operation
Current Weather
METAR KAXV 212355Z AUTO 05011G16KT 10SM CLR 15/07 A3020 RMK AO2
Flight Category
VFR
Wind
50° at 11 kt G16
Visibility
10+ SM
Temperature
15°C
Dewpoint
7°C
Altimeter
1022.80 inHg
Cloud Cover
CLR
Nearest weather from KAXV (12 NM away)
Observed 2026-05-21 23:55Z
Runways
| ID | Length | Width | Surface | Lights |
|---|---|---|---|---|
| 09W/27W | 7,000 ft | 4000 ft | WATER | - |
Frequencies
| Type | Frequency | Name |
|---|---|---|
| CTAF | 122.9 | GRAND LAKE ST MARYS |
Active NOTAMs
Nearby Airports in Ohio
0D7
ADA
ADA — 949 ft
K0D7
Ada Airport
Ada — 949 ft
83OH
Adams Strip
Pleasant Hill — 973 ft
83OH
ADAMS STRIP
PLEASANT HILL — 973 ft
50OH
Aerodrome Les Noyers
Jamestown — 1,085 ft
50OH
AERODROME LES NOYERS
JAMESTOWN — 1,085 ft
55OI
AERO FLIGHT CENTER
EAST PALESTINE — 1,140 ft
55OI
Aero Flight Center Airport
East Palestine — 1,140 ft
Nearest airports
- 0D7 — ADA
ADA
- K0D7 — Ada Airport
Ada
- 83OH — Adams Strip
Pleasant Hill
- 83OH — ADAMS STRIP
PLEASANT HILL
- 50OH — Aerodrome Les Noyers
Jamestown
Ohio airports
O12 Operational Overview
Location & Facility
GRAND LAKE ST MARYS (O12) is a publicly owned seaplane base open to the public located in ST MARYS, Ohio, United States. The field sits at an elevation of 871 feet above mean sea level (MSL) at coordinates 40.5410°N, 84.4907°W.
Runways
GRAND LAKE ST MARYS has 1 runway. The longest runway (09W/27W) measures 7,000 feet by 4000 feet with a water surface.
Communications & Operations
GRAND LAKE ST MARYS is a non-towered (pilot-controlled) field. A total of 1 communication frequencies are published for this facility.
Services & Fuel
GRAND LAKE ST MARYS offers 100LL fuel. Pilots planning fuel stops should confirm availability with the FBO, as hours and pricing may vary.
Current Conditions
The current flight category at GRAND LAKE ST MARYS is VFR (Visual Flight Rules — good flying conditions). Weather conditions are updated in real-time from official NOAA Aviation Weather Center observations. There is currently 1 active NOTAM for this facility.
Frequently Asked Questions
What is O12?
O12 is the ICAO identifier for GRAND LAKE ST MARYS, a public-use airport located in ST MARYS, Ohio, United States.
How many runways does GRAND LAKE ST MARYS have?
GRAND LAKE ST MARYS (O12) has 1 runway. See the runway table above for dimensions and surface types.
What is the elevation of O12?
The field elevation of GRAND LAKE ST MARYS is 871 feet above mean sea level (MSL).
Is fuel available at O12?
Yes, GRAND LAKE ST MARYS offers 100LL fuel.
What are the current weather conditions at O12?
The current flight category at GRAND LAKE ST MARYS is VFR. See the METAR section above for full decoded weather data including wind, visibility, temperature, and altimeter.
Are there active NOTAMs at O12?
There are currently 1 active NOTAM for GRAND LAKE ST MARYS. Sign up for AeroCopilot to read decoded NOTAM text and AI interpretations.
How do I access complete data for O12?
Sign up for a free AeroCopilot account to access all frequencies, full NOTAM text with AI interpretation, decoded forecasts, and IFR procedure charts for GRAND LAKE ST MARYS.
Where is GRAND LAKE ST MARYS located?
GRAND LAKE ST MARYS (O12) is located in ST MARYS, Ohio, United States, at an elevation of 871 ft MSL.