3S4 · Illinois Valley Airport

CAVE JUNCTION, OREGON · SMALL AIRPORT

1,394

Elevation ft

Runway

4,807

Longest ft · 18/36

42.10N

123.68W

Illinois Valley Airport serves Cave Junction, Oregon at 1,394 ft elevation with its longest runway, 18/36, at 4,807 by 60 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 3S4 in JetDesk: live METAR, TAF, winds and runway verdict →

01Runways

Runway	Length × width	Surface	Lighting
18/36	4,807 × 60 ft	asphalt	lit

02Density altitude and turboprop runway margins

Standard temperature at 1,394 ft is about 12°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, 12°C)	1,394 ft	2,710 ft	2,257 ft	3,386 ft
Warm day (ISA +10)	2,594 ft	2,944 ft	2,384 ft	3,576 ft
Hot day (ISA +20)	3,794 ft	3,178 ft	2,510 ft	3,765 ft
35°C afternoon	4,129 ft	3,243 ft	2,546 ft	3,818 ft

Planning aid only. Even on a 35°C afternoon the longest runway (18/36, 4,807 ft) covers a Meridian-class turboprop's landing distance with a 50 percent margin (3,818 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 3S4 is high, or as the longer runway on a hot afternoon.

Airport	Distance	Longest runway
KCEC Jack Mc Namara Field Airport	32 nm SW	5,002 ft
KMFR Rogue Valley International-Medford Airport	39 nm NE	8,800 ft
KSIY Siskiyou County Airport	58 nm E	7,490 ft
KO46 Weed Airport	66 nm SE	5,000 ft
KRBG Roseburg Regional Airport	70 nm N	5,003 ft

04Jet A prices and FBOs at 3S4

No public API publishes FBO fuel prices, so JetDesk does not guess. Pilots and crews log the price they actually paid at 3S4, 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 3S4 or read what a fuel stop actually saves.

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