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O12 Grand Lake St Marys Seaplane Base
St Marys, Ohio, USA

GOING TO ST MARYS?

FAA INFORMATION EFFECTIVE 25 DECEMBER 2025

Location

FAA Identifier: O12
Lat/Long: 40-32-27.6700N 084-29-26.4300W
40-32.461167N 084-29.440500W
40.5410194,-84.4906750
(estimated)
Elevation: 871 ft. / 265 m (estimated)
From city: 5 miles NE of ST MARYS, OH
Time zone: UTC -5 (UTC -4 during Daylight Saving Time)
Zip code: 45822

Seaplane Base Operations

Seaplane Base use: Open to the public
Activation date: 04/1995
Control tower: no
ARTCC: INDIANAPOLIS CENTER
FSS: DAYTON FLIGHT SERVICE STATION
NOTAMs facility: DAY (NOTAM-D service available)
Attendance: APR-NOV 0800-1700
ARPT CLSD NOV 15 TO APR 1 & MEMORIAL & LABOR DAY.
Segmented circle: no

Seaplane Base Communications

CTAF: 122.9
WX AWOS-3PT at AXV (9 nm E): 128.325 (419-753-2821)
  • ACFT OPRG AT GRAND LAKE ST MARYS SHOULD MNT TFC ON LAKEFIELD CTAF & NEIL ARMSTRONG CTAF.

Nearby radio navigation aids

VOR radial/distance  VOR name  Freq  Var
RODr312/25.5ROSEWOOD VORTAC117.5005W
DQNr353/31.8DAYTON VOR/DME114.5001W

Seaplane Base Services

Fuel available: 100LL
100LL:100LL AVBL ON REQ, PPR, CTC KOZY MARINA 419-394-8797.

Runway Information

Runway 9W/27W

Dimensions: 7000 x 4000 ft. / 2134 x 1219 m
Surface: water
RUNWAY 9W  RUNWAY 27W
Traffic pattern: leftright
Markings: buoys, in good conditionbuoys, in good condition

Seaplane Base Ownership and Management from official FAA records

Ownership: Publicly-owned
Owner: OHIO DIV OF PARKS & REC
834 EDGEWATER DR
SAINT MARYS, OH 45885-1132
Phone 419-394-3611
Manager: DAVID FALER, ASST PARK MGR
GRAND LAKE SAINT MARYS STATE PARK, 834 EDGEWATER DR
SAINT MARYS, OH 45885-1132
Phone 419-394-3611
CELL 419-656-7060.

Additional Remarks

- 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.

Instrument Procedures

There are no published instrument procedures at O12.

Some nearby airports with instrument procedures:

KCQA - Lakefield Airport (5 nm SW)
KAXV - Neil Armstrong Airport (9 nm E)
KVNW - Van Wert County Airport (20 nm N)
KVES - Darke County Airport (20 nm S)
KAOH - Lima Allen County Airport (23 nm NE)
  
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City of Middletown
 
Area around O12 (Grand Lake St Marys Seaplane Base)
 
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Aerial photo
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Sectional chart

 
Airport distance calculator
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From to O12

Sunrise and sunset
Times for 21-Jan-2026
 Local
(UTC-5)		 Zulu
(UTC)
Morning civil twilight07:2812:28
Sunrise07:5712:57
Sunset17:4122:41
Evening civil twilight18:1123:11

Current date and time
Zulu (UTC)  21-Jan-2026 14:31:58
Local (UTC-5)  21-Jan-2026 09:31:58
 
METAR
KAXV 
9nm E 		211415Z AUTO 19017G24KT 10SM SCT070 BKN090 BKN110 M02/M09 A3001 RMK AO2
TAF
KDAY 
40nm S 		211124Z 2112/2212 19013G24KT P6SM OVC060 WS020/21045KT FM211400 21016G25KT P6SM OVC045 PROB30 2114/2118 4SM -SN OVC025 FM211800 22017G27KT P6SM OVC025 FM212100 23014G23KT P6SM OVC015 FM220000 23012G21KT P6SM BKN025 FM220400 24012KT P6SM BKN035 FM220800 27012KT P6SM BKN050
KFWA 
41nm NW 		211134Z 2112/2212 18013KT P6SM SCT035 BKN050 WS020/23040KT FM211400 21015G25KT P6SM VCSH SCT025 BKN035 PROB30 2115/2119 21015KT 4SM -SHSN BR BKN025 FM211900 24018G29KT P6SM SCT035 BKN050 FM220100 27015KT P6SM BKN070 WS020/25045KT FM220900 28015G25KT P6SM BKN050
KFDY 
47nm NE 		211139Z 2112/2212 18012G20KT P6SM -SHSN OVC035 TEMPO 2112/2116 3SM -SHSN OVC025 FM211600 22019G28KT P6SM BKN035 FM220000 24013KT P6SM OVC035 FM220600 26017G23KT P6SM OVC035
KFFO 
48nm SE 		211100Z 2111/2217 19012KT 9999 BKN030 OVC060 WS020/20045KT 650307 QNH3007INS TEMPO 2113/2116 21015G25KT 8000 -SN OVC015 650159 520003 BECMG 2115/2116 22010G15KT 9999 BKN010 OVC025 650105 520103 QNH3003INS TEMPO 2116/2118 22015G25KT 6000 -SN BKN007 OVC015 650075 520002 BECMG 2117/2118 23012G18KT 9999 OVC007 650075 520103 QNH2995INS TEMPO 2118/2124 23015G25KT 8000 -SNRA OVC010 640102 520002 BECMG 2123/2124 23012G18KT 9999 OVC020 620204 510102 QNH2999INS BECMG 2206/2207 26010G15KT 9999 BKN025 62025
NOTAMs
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