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

GOING TO ST MARYS?

FAA INFORMATION EFFECTIVE 27 NOVEMBER 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 09-Dec-2025
 Local
(UTC-5)		 Zulu
(UTC)
Morning civil twilight07:2012:20
Sunrise07:5112:51
Sunset17:1022:10
Evening civil twilight17:4122:41

Current date and time
Zulu (UTC)  10-Dec-2025 01:13:41
Local (UTC-5)  09-Dec-2025 20:13:41
 
METAR
KAXV 
9nm E 		100055Z AUTO 20011G15KT 10SM OVC100 02/M01 A2972 RMK AO2
TAF
KDAY 
40nm S 		091740Z 0918/1018 21016G26KT P6SM FEW040 BKN250 FM100000 21015G25KT P6SM OVC080 WS020/22045KT FM100700 21017G32KT 5SM -RA SCT025 OVC050 WS020/21045KT FM101000 23020G35KT 4SM -RASN OVC015 FM101300 23019G34KT 4SM -SHRA BR OVC008 FM101600 26019G34KT 3SM -SHRA BR BKN011
KFWA 
41nm NW 		092135Z 0922/1018 21013KT P6SM SCT025 BKN150 FM100200 20017KT P6SM -RA OVC040 WS020/23050KT FM100600 21019KT 5SM -RA OVC025 WS020/24050KT FM100800 22024KT 4SM BR OVC015 WS020/25055KT FM101200 25020KT 3SM -RA OVC008 WS020/25050KT FM101600 28020KT 2SM -RASN OVC008
KFDY 
47nm NE 		091737Z 0918/1018 22017G28KT P6SM BKN090 FM100400 20020G32KT 3SM -RA BR OVC035 FM100800 22022G33KT 2SM RA BR OVC015 FM101300 24022G32KT 3SM -SHRA BR OVC008
KFFO 
48nm SE 		091900Z 0919/1101 21012G20KT 9999 SCT020 BKN080 520003 QNH2978INS TEMPO 0919/0923 20015G25KT BKN020 BKN080 620206 BECMG 0922/0923 21012G18KT 9999 BKN020 BKN080 620208 530103 QNH2964INS TEMPO 0923/1005 22015G25KT BECMG 1004/1005 21015G25KT 9999 VCSH BKN018 BKN025 WS020/22040KT 620258 QNH2945INS TEMPO 1007/1015 23025G35KT 6000 -RA BKN015 OVC030 520003 BECMG 1014/1015 24015G25KT 9000 -RA BKN018 BKN025 620258 510003 QNH2947INS WND 200V300 TEMPO 1015/1024 23025G35KT 520003 BECMG 1023/1024 32015G25KT
NOTAMs
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