C47 Portage Muni

PROBABLE 70%

Runway 22 — wind slightly favors it, low confidence

Based mostly on wind; no traffic or ATIS to confirm. No D-ATIS feed here — a voice ATIS/AWOS may exist; check the frequency. No ADS-B traffic data available.

certainty: 70% evidence: WEAK no tower now

Wind 220° true at 12 kt · VFR · 18 min old · from KDLL (12.8 nm away)

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22 70% 2668 ft · 12 kt head, 1 kt x-left

18 30% 3770 ft · 9 kt head, 8 kt x-right

36 <1% 3770 ft · 9 kt TAIL, 8 kt x-left

4 <1% 2668 ft · 12 kt TAIL, 1 kt x-right

Why — evidence behind this answer

Runway 22

WIND 12 kt headwind, 1 kt left crosswind 18 min ago +2.58
PRIOR runway length 2668 ft -0.04

Runway 18

WIND 9 kt headwind, 8 kt right crosswind 18 min ago +1.67
PRIOR runway length 3770 ft +0.04

Runway 36

WIND 9 kt TAILWIND, 8 kt left crosswind 18 min ago -12.50
PRIOR runway length 3770 ft +0.04

Runway 4

WIND 12 kt TAILWIND, 1 kt right crosswind 18 min ago -21.33
PRIOR runway length 2668 ft -0.04

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	18 min	Nearest station KDLL (12.8 nm away)
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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C47 field & runways

Portage Muni, Portage, Wisconsin. Field elevation 825 ft. Non-towered (NON-ATCT). Magnetic variation 3.0°W on record, 3.0°W 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 0.03°/year west — about 1° every 33 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
18	177.8°	180.8°	matches	3,770 ft	ASPH	left
22	222.9°	225.9°	runway 23 by the rule today · 5.9° past	2,668 ft	ASPH	left
36	357.8°	0.8°	matches	3,770 ft	ASPH	left
4	43.0°	45.9°	runway 5 by the rule today · 5.9° past	2,668 ft	ASPH	left

Generated 11:13:17Z · auto-refreshes · JSON

C47 ☆ Portage Muni