FAA 7460-1 › Michigan ›
Building or using a crane near Green Lake (Y88)?
Green Lake in Interlochen, Michigan is a public-use airport. Under 14 CFR 77.9, anything within 10,000 feet of its runways that rises above a 50:1 slope needs FAA Form 7460-1 at least 45 days before construction. Check your exact site free.
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How tall can you build near Y88 without filing?
The notice surface rises 1 foot for every 50 feet of horizontal distance from the nearest point of the nearest runway, starting at the runway's elevation. Using the lowest runway-end elevation, 866 ft above sea level:
| Distance from nearest runway | Notice required above (height over 866 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 5 ft | 871 ft |
| 500 ft | 10 ft | 876 ft |
| 1,000 ft | 20 ft | 886 ft |
| 2,000 ft | 40 ft | 906 ft |
| 3,000 ft | 60 ft | 926 ft |
| 5,000 ft | 100 ft | 966 ft |
| 7,500 ft | 150 ft | 1,016 ft |
| 10,000 ft | 200 ft | 1,066 ft |
| Beyond 10,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 866 ft you can build taller by the difference; if it's higher, less. Cranes count at their maximum height. The free check above uses USGS ground elevation for your exact spot.
Runways and notice boundary
Dashed line: the 10,000-ft area where the 50:1 notice slope applies; inner line: 5,000 ft.
| Runway | Length | End elevations (ft AMSL) |
|---|---|---|
| 05/23 | 2,800 ft | 866 / 866 |
| 16/34 | 1,700 ft | 866 / 866 |
Filing Form 7460-1 near Y88
- File online through the FAA's OE/AAA system at least 45 days before construction or before applying for a building permit, whichever is first. Filing is free.
- You need NAD 83 coordinates, site ground elevation, structure height above ground and above sea level.
- Construction on airport property always needs notice, whatever the height.
More: Do I need to file Form 7460-1? · Cranes and Form 7460-1
Other public-use airports nearby
- 4M0 — Lake Ann Airway Estates (9 nm)
- 7Y2 — Thompsonville (11 nm)
- TVC — Cherry Capital (11 nm)
- Y87 — William B Bolton (15 nm)
- Y59 — Six Mile (16 nm)
- Y68 — Joyfield (17 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.