William E. Koenig Airport

01IS · Dow, IL · 670 ft elevation

Overview Weather Runways Comms & NavAids Charts Services & info

Airport information

FAA LID: 01IS
Coordinates: 39.0162, -90.3182
Elevation: 670 ft MSL

Detailed FAA facility data isn't available for this airport.

Weather

METAR observed

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TAF forecast

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Sun & FAA night 2026-06-21

Event	Local (CDT)	UTC
Morning civil twilight Loggable night ends	05:03 AM	10:03Z
Sunrise	05:36 AM	10:36Z
Sunset	08:30 PM	01:30Z
Evening civil twilight Loggable night begins	09:03 PM	02:03Z

Loggable night (§1.1)

09:03 PM → 05:03 AM

Night currency (§61.57)

09:30 PM → 04:36 AM

Plan a flight from 01IS

Destination (ICAO)

TAS (kt)Burn (gph)Reserve (hr)Wind from (°)Wind (kt)

Traffic pattern

Landing runway

LEFT traffic

Landing: Rwy 09
Pattern: left (turns left)
TPA: 1,700 ft MSL (≈1,000 AGL)

Enter the left downwind for Rwy 09 at 1,700 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).

Runway 09/27

1,300 ft × 100 ft · TURF

Heading: n/a

Heading: n/a

Headings shown are true (magnetic variation unavailable).

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

Runway	Length	Your margin
09/27	1,300 ft

Nearby navigation aids

NavAid	Type	Freq	Radial / Dist magnetic
STL · St Louis	VORTAC	117.40	r038° / 12.1 NM
CSX · Cardinal	VOR-DME	116.45	r007° / 15.9 NM
TOY · Troy	VORTAC	116.00	r308° / 25 NM
SKE · Scott	TACAN	112.20	r320° / 35.7 NM
FTZ · Foristell	VORTAC	110.80	r052° / 36.1 NM

VFR sectional

Open 01IS on the VFR sectional (SkyVector) ↗

No published instrument procedures or Chart Supplement for 01IS. VFR sectional link above.

No published services or facility detail for 01IS.

Nearby airports

0LL3 · Koenig AirportPrivate (3 NM)LL49 · Raymond Restricted Landing AreaPrivate (3 NM)0LL1 · Jerseyville Aviation Inc AirportPrivate (5 NM)KSET · St Charles County Regional Airport/Smartt Field (7 NM)KALN · St Louis Regional Airport (15 NM)KSTL · St. Louis Lambert International Airport (16 NM)

Weather is live from the Aviation Weather Center; airport facility data is from the FAA NASR (28-day cycle). For planning and education only; always verify against official sources. Open 01IS in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.

About 01IS

William E. Koenig Airport (01IS) is an airport in Dow, IL, at 670 ft MSL. It has 1 runway, the longest 1,300 ft. This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 01IS, refreshed from the Aviation Weather Center and FAA NASR.

What is the longest runway at 01IS?

William E. Koenig Airport has 1 runway; the longest is 1,300 ft. See the Runways tab for headings, surface, and lighting.

Where is 01IS?

William E. Koenig Airport is in Dow, IL, at an elevation of 670 ft MSL. Coordinates: 39.0162, -90.3182.

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