Grindstone Air Harbor Airport
Daylight today(Jul 21, 2026, local time)
About 15h 0m of daylight. Civil twilight (dawn/dusk) approximates the FAA definition of night for logging and currency. Times are computed and approximate — verify with official sources.
About Grindstone Air Harbor Airport
Grindstone Air Harbor Airport is a small airport in Port Austin, United States. It sits at an elevation of 640 ft (195 m) and has 1 runway, the longest 1,800 ft / 549 m. It observes America/Detroit local time. The nearest airport is Engler Field (E53), about 13.4 nm to the ssw.
Summary generated from this airport’s structured data — reference only.
Map
Runway centrelines, navaids and overlapping airspace. Tiles © OpenStreetMap contributors. Reference only — not for navigation.
Runways (1)
| Runway | Length | Width | Surface | Lighting | Status |
|---|---|---|---|---|---|
| 18 / 36 | 1,800 ft / 549 m | 85 ft | Turf-f | Unlit | Open |
Airspace in this area(2)
| Name | Class | Type | Floor | Ceiling |
|---|---|---|---|---|
| STEELHEAD BY NOTAM | Special use | Danger | 6000 ft MSL | FL180 |
| STEELHEAD LOW EAST BY NOTAM | Special use | Danger | 500 ft GND | 6000 ft MSL |
Approximate bounding-box match from OpenAIP · all United States airspace. Reference only — consult official charts for exact boundaries and status.
Tall obstacles nearby
| Obstacle | Height AGL | Top (MSL) | Lit |
|---|---|---|---|
| Obstacle | — | 666 ft | — |
| Obstacle | — | 692 ft | — |
| Obstacle | — | 696 ft | — |
| Obstacle | — | 640 ft | — |
| Obstacle | — | 617 ft | — |
| Sigel Wind Park | — | 719 ft | — |
| Obstacle | — | 732 ft | — |
| Obstacle | — | 620 ft | — |
Tallest obstacles within ~10 nm. Data via OpenAIP. Reference only — consult official charts.
Nearby airports
Great-circle distance and true bearing from Grindstone Air Harbor Airport.
Frequently asked questions
Where is Grindstone Air Harbor Airport located?
Grindstone Air Harbor Airport is small airport located in Port Austin, United States, at an elevation of 640 ft (195 m).
How many runways does Grindstone Air Harbor Airport have?
Grindstone Air Harbor Airport has 1 runway, the longest being 1,800 ft / 549 m.
What time zone is Grindstone Air Harbor Airport in?
Grindstone Air Harbor Airport is in the America/Detroit time zone (UTC-04:00).
What is the magnetic variation at Grindstone Air Harbor Airport?
The magnetic variation (declination) at Grindstone Air Harbor Airport is approximately 7.9° W, per the World Magnetic Model. Variation changes slowly over time — always use the current value charted for navigation.
What airports are near Grindstone Air Harbor Airport?
The nearest airport to Grindstone Air Harbor Airport is Engler Field (E53), about 13.4 nm to the ssw, followed by Huron County Memorial Airport and Gentner Strip Airport.
Is the information on this page suitable for flight planning?
No. Grindstone Air Harbor Airport data here is for reference and training only — not for navigation. Always consult official sources and current charts before any flight.