4U9 · Hyak Airbase

DELL, MONTANA · SMALL AIRPORT

6,007

Elevation ft

Runway

7,002

Longest ft · 14/32

44.74N

112.72W

Hyak Airbase serves Dell, Montana at 6,007 ft elevation with its longest runway, 14/32, at 7,002 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 4U9 in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
14/32	7,002 × 75 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 6,007 ft is about 3°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, 3°C)	6,007 ft	3,610 ft	2,744 ft	4,116 ft
Warm day (ISA +10)	7,207 ft	3,844 ft	2,870 ft	4,306 ft
Hot day (ISA +20)	8,407 ft	4,078 ft	2,997 ft	4,495 ft
35°C afternoon	9,849 ft	4,359 ft	3,149 ft	4,724 ft

Planning aid only. Even on a 35°C afternoon the longest runway (14/32, 7,002 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (4,724 ft needed). 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 4U9 is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KDLN Dillon Airport	32 nm N	6,501 ft
KRVF Ruby Valley Field	51 nm N	6,000 ft
KSMN Lemhi County Airport	55 nm NW	5,510 ft
KEKS Ennis Big Sky Airport	56 nm NE	7,600 ft
KWYS Yellowstone Airport	68 nm E	8,400 ft

04Jet A prices and FBOs at 4U9

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at 4U9, 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 4U9 or read what a fuel stop actually saves.

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