KALN St Louis Rgnl

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. No ADS-B traffic data available. Wind calm — no directional preference.

certainty: — evidence: NONE Class D

Wind calm · VFR · 28 min old · from KSTL (17.4 nm away)

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11 26% 8099 ft

29 26% 8099 ft

17 24% 6500 ft

35 24% 6500 ft

Active NOTAMs affecting runways

APCH OTS RWY 29 until 02-02 13:48Z

IAP ST LOUIS RGNL, ALTON/ST LOUIS, IL. ILS OR LOC RWY 29, AMDT 12D... DME REQUIRED EXCEPT FOR ACFT EQUIPPED WITH SUITABLE RNAV SYSTEM WITH GPS, STL VORTAC OUT OF SERVICE.

Why — evidence behind this answer

Runway 11

PRIOR runway length 8099 ft +0.02

Runway 29

PRIOR runway length 8099 ft +0.02

Runway 17

PRIOR runway length 6500 ft -0.02

Runway 35

PRIOR runway length 6500 ft -0.02

Sources consulted

source	status	age	note
D_ATIS	UNAVAILABLE		No D-ATIS at this field
METAR	OK	28 min	Nearest station KSTL (17.4 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)

Was this right?

KALN field & runways

St Louis Rgnl, Alton/St Louis, Illinois. Field elevation 544 ft. Class D airspace. Towered. Magnetic variation 1.0°W on record, 2.2°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 0.053°/year west — about 1° every 19 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
11	113.5°	115.6°	runway 12 by the rule today · 5.6° past	8,099 ft	ASPH	left
17	173.4°	175.5°	runway 18 by the rule today · 5.5° past	6,500 ft	ASPH	left
29	293.4°	295.6°	runway 30 by the rule today · 5.6° past	8,099 ft	ASPH	left	ILS
35	353.4°	355.5°	runway 36 by the rule today · 5.5° past	6,500 ft	ASPH	left

Generated 11:18:31Z · auto-refreshes · JSON

KALN ☆ St Louis Rgnl