FAA 7460-1 › Idaho ›
Building or using a crane near Cougar Ranch (D47)?
Cougar Ranch in Challis, Idaho 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 D47 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, 4,267 ft above sea level:
| Distance from nearest runway | Notice required above (height over 4,267 ft) | …which is this elevation (AMSL) |
|---|---|---|
| 250 ft | 5 ft | 4,272 ft |
| 500 ft | 10 ft | 4,277 ft |
| 1,000 ft | 20 ft | 4,287 ft |
| 2,000 ft | 40 ft | 4,307 ft |
| 3,000 ft | 60 ft | 4,327 ft |
| 5,000 ft | 100 ft | 4,367 ft |
| 7,500 ft | 150 ft | 4,417 ft |
| 10,000 ft | 200 ft | 4,467 ft |
| Beyond 10,000 ft | Only the 200-ft-above-ground rule applies (77.9(a)) | |
If your ground is lower than 4,267 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) |
|---|---|---|
| 02/20 | 1,400 ft | 4277 / 4267 |
Filing Form 7460-1 near D47
- 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
- 0U3 — Mahoney Creek Usfs (0 nm)
- ID8 — Marble Creek (3 nm)
- 2U8 — Thomas Creek (4 nm)
- C53 — Lower Loon Creek (6 nm)
- S81 — Indian Creek Usfs (8 nm)
- 4D2 — Hoodoo Meadows (24 nm)
Source: FAA airport, runway and runway-end data (NASR cycle effective 2026/10/01). Screening only — the FAA issues determinations.