Chinook, Montana
S71 Edgar G Obie
Edgar G Obie (S71) is a non-towered, public-use airport in Chinook, Montana, at 2,416 ft MSL. Its runway is 08/26 (4,000 by 75 ft, asphalt). Published pattern altitude 800 ft AGL (about 3,216 ft MSL). CTAF 122.8.
FAA NASR data effective Oct 29, 2026. Not for navigation; verify with current FAA charts and the Chart Supplement.
Airport
At a glance
- Identifiers
- FAA S71
- Location
- Chinook, Montana (Blaine County). 1 NM W of the city center
- Elevation
- 2,416 ft MSL
- Position
- 48.5921° N, 109.2506° W
- Pattern altitude
- 800 ft AGL
- Control tower
- No, non-towered
- Sectional chart
- Great Falls
- Magnetic variation
- 16° E (1985)
- Fuel
- 100LL
- Ownership
- Publicly owned, open to the public
- Attendance
- Daily 0700-1900
1 runway
Runways
| Runway | Length × width | Surface | Edge lights |
|---|---|---|---|
| 08/26 | 4,000 × 75 ft | Asphalt, good condition | Medium intensity |
Runway ends and traffic pattern
| End | Pattern | Glide slope lights | Instrument | Displaced threshold | Landing distance |
|---|---|---|---|---|---|
| 08 | Left traffic | None listed | None listed | None listed | Not listed |
| 26 | Left traffic | 2-light PAPI, left | None listed | None listed | Not listed |
VHF
Frequencies
- CTAF
- 122.8
- Actvt Papi Rwy 26; Mirl Rwy 08/26 Dawn-Dusk - Ctaf. After Dusk Mirl on Consly Til Dawn.
- UNICOM
- 122.8
Weather station
- AWOS-AV S71
- 118.35
Before you go
Brief S71 in Ascent EFB.
Current weather, NOTAMs and the airport diagram for Edgar G Obie, in the app on iPhone and iPad.
Not for navigation. Verify with current FAA charts and the Chart Supplement before flight.
Source: FAA NASR 28-day subscription, cycle effective Oct 29, 2026. Airport data changes every 28 days and NOTAMs can override it at any time.