3S4 Illinois Valley

PROBABLE 68%

Runway 36 — local convention slightly favors it

No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available. No weather observation available.

certainty: 68% evidence: NONE no tower now

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36 62% 4807 ft · calm-wind rwy

18 38% 4807 ft

Why — evidence behind this answer

Runway 36

PRIOR 36 is the designated calm-wind runway +0.50

Sources consulted

source	status	note
D_ATIS	UNAVAILABLE	No D-ATIS at this field
METAR	UNAVAILABLE	No weather observation found
ADSB	UNAVAILABLE	No ADS-B track history here yet
NOTAM	OK
CIFP	NOT_CONFIGURED	Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (No ADS-B track history here yet)

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3S4 field & runways

Illinois Valley, Cave Junction, Oregon. Field elevation 1394 ft. Non-towered (NON-ATCT). Magnetic variation 18.0°E on record, 13.9°E today.

The FAA's variation of record is the number this field was surveyed against; the second is where north points now, from WMM2025. It is moving 0.105°/year west — about 1° every 10 years — which is why runway numbers eventually stop matching their pavement.

Runway data from the FAA NASR 01 Oct 2026 cycle. Where NASR locates both thresholds, the true heading is the bearing between them rather than NASR's whole-degree alignment. Magnetic is that heading against *today's* declination from WMM2025, not the field's variation of record — so it can differ from the chart by the gap between the two shown above. The number painted on the runway is the one ATC uses.
Runway	True	Magnetic	Number	Length	Surface	Pattern	Notes
18	196.6°	182.6°	matches rule gives runway 19 in ~22 yr	4,807 ft	ASPH	left
36	16.6°	2.6°	matches rule gives runway 1 in ~22 yr	4,807 ft	ASPH	left	calm-wind RY 36 DESIGNATED CALM WIND RY.

Generated 09:14:30Z · auto-refreshes · JSON

3S4 ☆ Illinois Valley