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

GOING TO ST MARYS?

FAA INFORMATION EFFECTIVE 01 OCTOBER 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 W 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 10-Oct-2026
 Local
(UTC-4)		 Zulu
(UTC)
Morning civil twilight07:1711:17
Sunrise07:4511:45
Sunset19:0523:05
Evening civil twilight19:3323:33

Current date and time
Zulu (UTC)  10-Oct-2026 19:21:56
Local (UTC-4)  10-Oct-2026 15:21:56
 
METAR
KAXV 
9nm E 		101824Z AUTO 13010KT 10SM CLR 21/10 A3021 RMK AO2
TAF
KDAY 
40nm S 		101740Z 1018/1118 14010KT P6SM BKN100 OVC250 FM102000 12010G18KT P6SM SCT040 OVC120 PROB30 1021/1101 -SHRA FM110100 10013G26KT P6SM -SHRA SCT015 OVC035 FM110400 09012G25KT P6SM -SHRA OVC015 FM110700 08009KT 5SM -SHRA BR OVC008 FM111400 05009KT P6SM OVC010
KFWA 
41nm NW 		101720Z 1018/1118 14010KT P6SM BKN250 FM102200 12008KT P6SM BKN200 PROB30 1103/1106 -SHRA OVC080 FM110600 10008KT P6SM -SHRA OVC035 FM111200 06007KT P6SM -SHRA OVC010
KFDY 
47nm NE 		101746Z 1018/1118 14010KT P6SM BKN250 FM110600 11008KT 6SM -SHRA SCT025 OVC040 FM111000 09009KT 5SM -SHRA SCT008 OVC015 FM111400 08007KT 5SM -SHRA BR OVC007
KFFO 
48nm SE 		101100Z 1011/1117 13006KT 9999 SCT100 BKN250 QNH3018INS BECMG 1014/1015 13009KT 9999 BKN080 OVC200 QNH3014INS BECMG 1022/1023 12010G15KT 8000 -SHRA BKN040 OVC100 510202 QNH3005INS TEMPO 1023/1107 12015G25KT 4800 SHRA BKN015 OVC030 BECMG 1105/1107 11009KT 9999 VCSH OVC015 510202 QNH2999INS TEMPO 1107/1111 11012G18KT 8000 -SHRA BKN009 OVC012 BECMG 1109/1111 09009KT 9999 NSW OVC007 QNH2995INS TX24/1019Z TN14/1011Z
NOTAMs
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