Building or using a crane near Belle Fourche Muni (EFC)?
Belle Fourche Muni in Belle Fourche, South Dakota is a public-use airport. Under 14 CFR 77.9, anything within 20,000 feet of its runways that rises above a 100:1 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 EFC without filing?
The notice surface rises 1 foot for every 100 feet of horizontal distance from the nearest point of the nearest runway, starting at the runway's elevation. Using the lowest runway-end elevation, 3,170 ft above sea level:
| Distance from nearest runway | Notice required above (height over 3,170 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 2 ft | 3,172 ft |
| 500 ft | 5 ft | 3,175 ft |
| 1,000 ft | 10 ft | 3,180 ft |
| 2,000 ft | 20 ft | 3,190 ft |
| 3,000 ft | 30 ft | 3,200 ft |
| 5,000 ft | 50 ft | 3,220 ft |
| 7,500 ft | 75 ft | 3,245 ft |
| 10,000 ft | 100 ft | 3,270 ft |
| 15,000 ft | 150 ft | 3,320 ft |
| 20,000 ft | 200 ft | 3,370 ft |
| Beyond 20,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 3,170 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 20,000-ft area where the 100:1 notice slope applies; inner line: 5,000 ft.
| Runway | Length | End elevations (ft AMSL) |
|---|---|---|
| 14/32 | 4,501 ft | 3169.9 / 3180.1 |
| 18/36 | 3,639 ft | 3190.6 / 3189.7 |
Filing Form 7460-1 near EFC
- 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
- SPF — Black Hills-clyde Ice Fld (16 nm)
- 49B — Sturgis Muni (28 nm)
- RCA — Ellsworth Afb (48 nm)
- 9D2 — Harding County (53 nm)
- RAP — Rapid City Rgnl (54 nm)
- CUT — Custer County (61 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.