Big Southern Butte (U46)
Non-towered public-use airport serving Atomic City, Idaho, at 5,073 ft elevation.
Elevation5,073 ft
ControlNon-towered
Longest runway2,600 ft
Magnetic variation16° E
High elevation. At 5,073 ft, density altitude on a warm day can be thousands of feet higher. Check performance with the density altitude calculator.
Live weather
Forecast (TAF)
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Frequencies
| CTAF | 122.9 |
|---|
Runways
| Runway | Size | Surface | Lights |
|---|---|---|---|
| 01/19 | 2,600 × 110 ft | Dirt |
No fuel listed. Sectional: Salt Lake City.
Runway diagram
Drawn to scale from FAA runway-end data, true north up. Not for navigation: use the official FAA airport diagram and Chart Supplement.
Nearby airports
U37Midway11 NM EU48Coxs Well15 NM SWKAOCArco-Butte County16 NM NW0U7Hollow Top24 NM WU97Howe24 NM N2U4Rockford Municipal27 NM SE
Before you fly here
- Read the FAA Chart Supplement entry for U46: traffic pattern, CTAF/UNICOM, hours, fuel and remarks.
- Check NOTAMs and get a weather briefing at 1800wxbrief.com.
- Study the airport diagram and the sectional around U46 for airspace and terrain.
- More detail: AirNav · SkyVector
Airport data from the FAA National Airspace System Resource (NASR) subscription effective Oct 1, 2026; magnetic variation as published for 1985. Weather is live from aviationweather.gov. Always confirm with current official sources before flight. This guide is a study aid.