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

GOING TO ST MARYS?

FAA INFORMATION EFFECTIVE 11 JUNE 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 15-Jun-2026
 Local
(UTC-4)		 Zulu
(UTC)
Morning civil twilight05:3409:34
Sunrise06:0810:08
Sunset21:0901:09
Evening civil twilight21:4201:42

Current date and time
Zulu (UTC)  16-Jun-2026 01:52:40
Local (UTC-4)  15-Jun-2026 21:52:40
 
METAR
KAXV 
9nm E 		160135Z AUTO 00000KT 10SM CLR 15/10 A2993 RMK AO2
TAF
KDAY 
40nm S 		152201Z 1522/1618 31006KT P6SM FEW070 FM160100 VRB03KT P6SM SKC FM161400 22012G18KT P6SM SCT050
KFWA 
41nm NW 		151726Z 1518/1618 26007KT P6SM SCT060 FM160100 24005KT P6SM FEW240 FM160900 21008KT P6SM SCT240 FM161300 22012G18KT P6SM FEW220 FM161700 23015G25KT P6SM BKN150 PROB30 1617/1618 4SM -SHRA OVC025
KFDY 
47nm NE 		151736Z 1518/1618 30006KT P6SM SCT060 FM152000 28007KT P6SM FEW250 FM160500 22007KT P6SM FEW250
KFFO 
48nm SE 		151900Z 1519/1701 33009KT 9999 BKN050 QNH2993INS BECMG 1600/1601 24006KT 9999 FEW050 FEW250 QNH2987INS BECMG 1612/1613 21009KT 9999 SCT060 BKN250 QNH2973INS TEMPO 1614/1622 22012G18KT BECMG 1621/1622 23012KT 8000 -SHRA SCT040 BKN060 OVC100 QNH2970INS TEMPO 1623/1701 23015G25KT 3200 -TSRA BKN040CB OVC060 TX25/1619Z TN15/1611Z
NOTAMs
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