KS71 · Edgar G Obie Airport

CHINOOK, MONTANA · SMALL AIRPORT

2,416

Elevation ft

Runway

4,000

Longest ft · 08/26

48.59N

109.25W

Edgar G Obie Airport serves Chinook, Montana at 2,416 ft elevation with its longest runway, 08/26, at 4,000 by 75 ft. The figures below are computed from FAA NASR runway data (via OurAirports) and the same rules of thumb JetDesk uses on the airport page in the app; the POH and current NOTAMs are the authority.

Open KS71 in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
08/26	4,000 × 75 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 2,416 ft is about 10°C. Every 1,000 ft of density altitude adds roughly 8 percent to a turboprop's takeoff distance and 5 percent to its landing distance. The table uses Piper Meridian book numbers (2,438 ft takeoff and 2,110 ft landing over a 50 ft obstacle at sea level, ISA, max weight) as a reference airplane; heavier turboprops and light jets scale the same way from their own POH figures.

Conditions	Density altitude	Takeoff est.	Landing est.	Landing × 1.5
Standard day (ISA, 10°C)	2,416 ft	2,909 ft	2,365 ft	3,547 ft
Warm day (ISA +10)	3,616 ft	3,143 ft	2,491 ft	3,737 ft
Hot day (ISA +20)	4,816 ft	3,377 ft	2,618 ft	3,927 ft
35°C afternoon	5,396 ft	3,490 ft	2,679 ft	4,019 ft

Planning aid only. On a 35°C afternoon the longest runway (08/26, 4,000 ft) is within 20 percent of the 1.5x landing figure for a Meridian-class turboprop (4,019 ft). Plan hot-day departures for the morning and check the POH. The percentages are a generic rule of thumb applied to one reference airplane, not certified performance data for any specific aircraft, and the runway size categories describe the runway, not your airplane's suitability. Verify with the approved flight manual before every flight.

03Nearby fields with 5,000 ft or more

Useful as alternates, as fuel stops when the price at KS71 is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KHVR Havre City County Airport	21 nm W	5,205 ft
KLWT Lewistown Municipal Airport	93 nm S	6,100 ft
KSBX Shelby Airport	104 nm W	5,005 ft
KGGW Glasgow Valley County Airport Wokal Field	108 nm E	5,002 ft
KGTF Great Falls International Airport	108 nm SW	10,502 ft

04Jet A prices and FBOs at KS71

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at KS71, the app flags a price stale after two weeks, and the route finder ranks every field within a corridor of your route by net savings after the cost of the extra cycle. Log a price at KS71 or read what a fuel stop actually saves.

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