29C Grindstone Air Harbor | Port Austin, MI

Before you fly into 29C

Conditions

VFR

Good for visual flying

Airport

Non-towered

Self-announce on CTAF

Pattern alt

1,640'

MSL · field 640' + 1,000 AGL

Favored RWY

RWY 18

H/W +4 · X/W 12 kt R

METAR & TAF 29C

29C does not publish a METAR.

Showing the nearest reporting station: KBAX (HURON COUNTY MEML) · 16.3 NM away. Conditions at 29C may differ.

METAR · KBAX

Observed 18:35Z

KBAX 121835Z AUTO 25013G18KT 10SM SCT032 SCT039 23/14 A2983 RMK AO2 T02300144

Wind: 250° @ 13G18 kt
Visibility: 10 SM
Temp / Dew: 23°C / 14°C
Altimeter: 29.83 inHg
Clouds: SCT
Density alt: 1,865 ft
Ceiling: Unlimited
Rules: VFR

29C does not issue a TAF.

Showing the forecast from the nearest station: KMBS (MBS INTL) · 59.2 NM away. Conditions at 29C may differ.

Forecast · TAF

Valid 12 18:00Z–13 18:00Z

TAF KMBS 121720Z 1218/1318 27015G24KT P6SM SCT040 FM130100 24008KT P6SM SCT050 FM131600 23018G30KT P6SM SCT050

BASEVFR

12 18:00Z–13 01:00Z

Wind: 270° at 15 kt gusting 24 kt
Visibility: ≥ 6 SM
Sky: Scattered 4,000 ft
Weather: None forecast

18Z

21Z

00Z

03Z

06Z

09Z

12Z

15Z

18Z

NOW

How to read

The top lane is always the active baseline (BASE + FM). Secondary lanes stack temporary and probabilistic deviations in the order they appear in the TAF.

Tap any pill to see the decoded conditions for that period.

Change indicators

BASEBase

Initial conditions at the start of the forecast.

FMFrom

A new baseline that replaces the previous forecast completely, starting at the stated time.

BECMGBecoming

Conditions change gradually over the window shown. By the end, the new conditions apply.

TEMPOTemporary

Fluctuating conditions lasting less than an hour at a time within the window — not the dominant forecast.

PROB30/40Probability

30 or 40% chance of the conditions occurring within the period. Never combined with BECMG.

Airport info & contacts

Manager on record, flight service, ARTCC, attendance schedule and pattern altitude — published by the FAA and refreshed every 28 days.

Location

From city: 4 NM E
VFR sectional: LAKE HURON
ARTCC: ZMP · MINNEAPOLIS
NOTAM facility: LAN (NOTAM-D)

Airport manager

Name: KELLY J HANSON
Phone: 989-269-7299
Address: 330 E HURON AVE, BAD AXE MI 48413-1449

Flight service · Hours

FSS LAN: LANSING1-800-WX-BRIEF
Attendance: Unattended

Frequencies

Tap any row to copy the frequency to your clipboard.

Advisory / CTAF

Runways & pattern

Full page

Runway & wind

tap a runway

250° · 13 kt

See full METAR & TAF

RWY 18

171°M

Head/Tail

+4 kt

Crosswind

12 kt R

Pattern entry · RWY 18

LEFT TRAFFIC

Runway	Heading (°M)	Length	Surface	Traffic
18/36Favored	171° / 351°	1,800 ft	TURF	Standard L

Runway end performance

End	TORA	TODA	ASDA	LDA	VGSI	Approach lights	Obstruction
18	—	—	—	—	—	—	18', trees, 0' from thr, 65' R of cntrln, slope 0
36	—	—	—	—	—	—	30', trees, 0' from thr, 65' R of cntrln, slope 0

Declared distances in feet. TORA = takeoff run available, TODA = takeoff distance, ASDA = accelerate-stop, LDA = landing distance.

Airport sketch

Runways drawn to scale from FAA survey coordinates, rendered over satellite imagery. Not for navigation.

Top-down satellite sketch of 29C GRINDSTONE AIR HARBOR in PORT AUSTIN, MICHIGAN, showing runways 18/36 drawn to scale over Esri World Imagery

Services on the field

Fuel grades, oxygen, maintenance, ramp storage and lighting — as declared to the FAA by the airport operator.

Fuel & services

Fuel: Not available

Ramp & ground

Transient storage: Not published
Wind indicator: Yes
Segmented circle: No

Fuel & FBOs

Cheapest 100LL and Jet A on the field and nearby. Always confirm with the FBO before taxi.

Cheapest 100LLNearby

$5.30

77G·Marlette Township Airport·44.8 nm

Cheapest Jet A

—

Not published

No on-field FBO prices. See nearby fuel options below.

Cheaper nearby (within 50 nm)

100LL$5.30at77GMarlette Township Airport44.8 nm

Airport notes

Surface conditions, obstructions, local procedures, lighting outages and other notes published with each FAA cycle.

General notes

FOR CD CTC MINNEAPOLIS ARTCC AT 651-463-5588.
DEER & LRG BIRDS ON & INVOF ARPT.

Approach & departure obstructions

183 FT YELLOW CONES.
363 FT YELLOW CONES.
18CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 16:1 TO THR OVR +76 FT TREE, 1244 FT DIST, 42 FT L. APCH RATIO 20:1 OVR 27 FT PLINE, 570 FT DIST, 125 FT L/R.
36CTLG OBSTN EXCEEDS A 45 DEG SLP. APCH RATIO 20:1 OVR 25 FT PLINE, 720 FT DIST, 125 FT L/R.

Other notes

MAN-MADE OR NATURAL OBJECTS EXIST WI THE ASP NEEDED TO ENSURE SAFETY IN THE TKOF/LDG OF ACFT.

VFR map & nearby airports

VFR sectional. Tap any ICAO chip to open that airport.

Key facts · 29C

Answer card

ICAO: 29C
Name: GRINDSTONE AIR HARBOR
Location: PORT AUSTIN, MICHIGAN
Elevation: 640 ft MSL
Traffic pattern altitude: 1,640 ft MSL (1,000 AGL)
Control tower: Non-towered (use CTAF)
Total runways: 1
Longest runway: 18/36 · 1,800 ft
Published ILS approaches: 0
Published frequencies: 1
Magnetic variation: 7°
Current flight rules: VFR
Current wind: 250° at 13 kt
Favored runway now: RWY 18

Grindstone Air Harbor (29C) sits in Port Austin, Michigan. Field elevation is 640 ft MSL. The airport has one runway. Runway 18/36 is 1,800 ft of turf, so plan for short-field performance and soft-field technique. There is no control tower. CTAF is 122.9. No ILS approaches are published here.

Pattern altitude is not published. Use the standard 1,000 ft AGL unless the current Chart Supplement says otherwise. That puts the pattern at 1,640 ft MSL based on the field elevation. Published remarks note objects in the approach surfaces. There are also cataloged obstructions on both ends, including trees and power lines. Three-foot yellow cones mark the ends of Runway 18 and Runway 36. Deer and large birds are reported on and near the airport. Keep a sharp scan on arrival and departure.

No on-field FBOs are listed. If you need fuel or ground services, contact the airport operator directly or call the field on CTAF for current availability. Clearance delivery is handled through Minneapolis ARTCC at 651-463-5588. With a turf runway, obstruction notes and wildlife activity, this is a field where a current briefing matters before you go.

Frequently asked questions

What is the pattern altitude at 29C?

Pattern altitude is not published. Use the standard 1,000 ft AGL unless the current Chart Supplement says otherwise. That works out to 1,640 ft MSL at this field elevation.

Does Grindstone Air Harbor have an ILS?

No ILS approaches are published for 29C. Check the current Chart Supplement for the latest approach data before you go.

Is 29C towered or non-towered?

29C is non-towered. Use CTAF 122.9 for local traffic calls.

What is the longest runway at Grindstone Air Harbor?

The longest runway is 18/36. It is 1,800 ft long and turf.

Are there any published obstructions at 29C?

Yes. Published remarks note obstructions in the approach surfaces on both ends. Trees and power lines are listed. Treat the field as a short and obstacle-sensitive arrival.

Are deer or birds a concern at 29C?

Yes. Deer and large birds are reported on and in the vicinity of the airport. A careful scan on final, rollout and climbout is a good idea.

Which FBOs are on the field at 29C?

No on-field FBOs are listed. Contact the airport operator directly before arrival. Call the field on CTAF for current FBO availability.

Who handles clearance delivery for 29C?

Published remarks say to contact Minneapolis ARTCC at 651-463-5588 for clearance delivery.

29C