FAA 7460-1 › Michigan ›
Building or using a crane near Robertson Fld (D99)?
Robertson Fld in Richmond, 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 D99 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, 646 ft above sea level:
| Distance from nearest runway | Notice required above (height over 646 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 5 ft | 651 ft |
| 500 ft | 10 ft | 656 ft |
| 1,000 ft | 20 ft | 666 ft |
| 2,000 ft | 40 ft | 686 ft |
| 3,000 ft | 60 ft | 706 ft |
| 5,000 ft | 100 ft | 746 ft |
| 7,500 ft | 150 ft | 796 ft |
| 10,000 ft | 200 ft | 846 ft |
| Beyond 10,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 646 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) |
|---|---|---|
| 09/27 | 2,455 ft | 649.8 / 646.2 |
Filing Form 7460-1 near D99
- 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
- 76G — Marine City (6 nm)
- PHN — St Clair County Intl (9 nm)
- 2E2 — Sharpe's Strip (10 nm)
- 57D — Ray Community (11 nm)
- MTC — Selfridge Angb (14 nm)
- 39G — Avoca (14 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.