S31 Lopez Island

UNKNOWN

Unknown — not enough evidence to call a runway

We don't know, and saying so beats guessing. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. ADS-B tracking just started here — traffic history is still building. No weather observation available.

certainty: — evidence: NONE no tower now

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16 50% 2905 ft · right traffic

34 50% 2905 ft

Why — evidence behind this answer

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	UNAVAILABLE		No weather observation found
ADSB	WARMING_UP	4001 min	Only 0 min of track history so far
NOTAM	OK
CIFP	NOT_CONFIGURED		Instrument procedures: phase 4

Recent operations

No operations observed in the last hour. (Only 0 min of track history so far)

Was this right?

S31 field & runways

Lopez Island, Lopez, Washington. Field elevation 209 ft. Non-towered (NON-ATCT). Magnetic variation 21.0°E on record, 15.2°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 0.129°/year west — about 1° every 8 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
16	179.8°	164.6°	matches rule gives runway 17 in ~3 yr	2,905 ft	ASPH	right
34	359.8°	344.6°	matches rule gives runway 35 in ~3 yr	2,905 ft	ASPH

Generated 11:13:27Z · auto-refreshes · JSON