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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 13-Jan-2026
 Local
(UTC-5)		 Zulu
(UTC)
Morning civil twilight07:3112:31
Sunrise08:0113:01
Sunset17:3222:32
Evening civil twilight18:0223:02

Current date and time
Zulu (UTC)  14-Jan-2026 02:47:40
Local (UTC-5)  13-Jan-2026 21:47:40
 
METAR
KAXV 
9nm E 		140235Z AUTO 21010KT 10SM CLR 05/00 A2963 RMK AO2
TAF
KDAY 
40nm S 		131736Z 1318/1418 22016G28KT P6SM BKN200 FM132300 23012G18KT P6SM BKN100 WS020/24040KT FM140400 24012KT P6SM BKN060 FM140900 27008KT P6SM OVC022 FM141300 29008KT 5SM BR BKN018 FM141500 32013G22KT P6SM BKN025 PROB30 1415/1418 5SM -SHSN
KFWA 
41nm NW 		131720Z 1318/1418 23018G30KT P6SM OVC100 FM132300 25012G20KT P6SM SCT040 BKN100 FM141100 28013G21KT P6SM VCSH OVC025 FM141500 32017G27KT 4SM -SHSN OVC015
KFDY 
47nm NE 		131732Z 1318/1418 20017G28KT P6SM OVC120 FM140000 23016G25KT P6SM FEW250 FM140800 26012G21KT P6SM BKN035 FM140900 26011G20KT P6SM OVC025 FM141500 29014G22KT 6SM -RASN OVC022 FM141700 30016G25KT 3SM -SN OVC018
KFFO 
48nm SE 		131900Z 1319/1501 21012G18KT 9999 FEW030 SCT080 BKN200 520073 QNH2966INS TEMPO 1319/1323 24015G25KT WND 210V300 BECMG 1322/1323 24012KT 9999 SCT040 BKN070 650804 520103 QNH2964INS WND 24009KT AFT 1403 BECMG 1407/1409 27009KT 8000 -RA BR BKN015 OVC040 620308 510102 QNH2960INS BECMG 1415/1416 30012G18KT 4800 -SHRASN BR OVC015 610153 620455 520103 QNH2964INS BECMG 1417/1419 33012G18KT 8000 -SHSN BR OVC020 610203 620505 520103 QNH2966INS TEMPO 1419/1501 33015G25KT 4800 -SHSN BR OVC015 610153 620455
NOTAMs
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