William E. Koenig Airport
01IS · Dow, IL · Print kneeboard
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Weather
METAR observed
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TAF forecast
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Sun & FAA night2026-08-04 · night begins 08:39 PM
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:35 AM | 10:35Z |
| Sunrise | 06:04 AM | 11:04Z |
| Sunset | 08:10 PM | 01:10Z |
| Evening civil twilight Loggable night begins | 08:39 PM | 01:39Z |
Plan a flight from 01IS
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Advisories
NOTAMs
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Pilot reports
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Airspace hazards
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Runways
RWY 27LEFT traffic
- Heading
- 270° true
- Dimensions
- 1,300 × 100 ft
- TPA
- 1,700 ft MSL (≈1,000 AGL) · standard
- Surface
- TURF
Enter the left downwind (heading 090°) on the 45° at 1,700 ft MSL (≈1,000 AGL).
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: schematic (headings + lengths)
Headings shown are true (magnetic variation unavailable).
| Runway | Length | Your margin |
|---|---|---|
| 09/27 | 1,300 ft |
Prefer one flat page? Full runway details for 01IS → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 01IS kneeboard →
Comms & NavAids
Nearby navigation aids
STL 117.40 · TOY 116.00 · SKE 112.20 · +1
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| STL · St Louis | VORTAC | 117.40 · 121X | High | r038° / 12.1 NM |
| TOY · Troy | VORTAC | 116.00 · 107X | Low | r308° / 25 NM |
| SKE · Scott | TACAN | 112.20 · 59X | — | r324° / 35.7 NM |
| FTZ · Foristell | VORTAC | 114.35 · 90Y | Low | r052° / 36.1 NM |
Charts & procedures
No published instrument procedures or Chart Supplement for 01IS — open it on the VFR sectional →
Airport 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.
No published services or facility detail for 01IS.
Nearby airports
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Also nearby: 0LL3 Koenig Airport (private) (3 NM) · LL49 Raymond Restricted Landing Area (private) (3 NM) · 0LL1 Jerseyville Aviation Inc Airport (private) (5 NM)
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 section 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.
Fly out of 01IS often?
Save 01IS as your home base in the SkyReady app for a one-tap Go/No-Go readiness brief, weather alerts, and automatic FAA currency — free to log.
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.