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

GOING TO ST MARYS?

FAA INFORMATION EFFECTIVE 14 MAY 2026

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 -4 (UTC -5 during Standard 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
Flying to Grand Lake St Marys Seaplane Base? Find the distance to fly.

From to O12

Sunrise and sunset
Times for 07-Jun-2026
 Local
(UTC-4)		 Zulu
(UTC)
Morning civil twilight05:3609:36
Sunrise06:0810:08
Sunset21:0501:05
Evening civil twilight21:3801:38

Current date and time
Zulu (UTC)  07-Jun-2026 14:04:19
Local (UTC-4)  07-Jun-2026 10:04:19
 
METAR
KAXV 
9nm E 		071355Z AUTO 04006KT 10SM BKN110 24/18 A3000 RMK AO2
TAF
KDAY 
40nm S 		071129Z 0712/0812 29005KT P6SM SCT040 BKN200 PROB30 0718/0721 3SM -TSRA BKN035CB FM072100 06005KT P6SM BKN100 FM080000 10008KT P6SM BKN070
KFWA 
41nm NW 		071120Z 0712/0812 VRB04KT P6SM BKN050 FM071400 08008KT P6SM BKN250 FM080600 09009KT P6SM OVC100
KFDY 
47nm NE 		071122Z 0712/0812 VRB02KT P6SM BKN050 FM071300 06007KT P6SM FEW250
KFFO 
48nm SE 		071100Z 0711/0817 27006KT 9999 FEW025 BKN045 QNH2994INS BECMG 0714/0715 33009KT 9999 SCT045 BKN090 QNH2995INS WND 300V020 TEMPO 0718/0724 01010G15KT 9000 -SHRA BKN035 OVC080 BECMG 0800/0801 10009KT 9999 SCT025 BKN040 OVC060 QNH3002INS BECMG 0814/0815 15009KT 9999 SCT045 BKN060 QNH3003INS TX29/0720Z TN22/0711Z
NOTAMs
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