1
Runway
0
Frequencies
0
Procedures
0
NOTAMs
Quick Facts
ICAO
01IS
FAA
01IS
Elevation
670 ft MSL
Runways
1
Frequencies
0
Tower
No
Fuel
N/A
Coordinates
39.016, -90.318
Airport Information
Facility Type
AIRPORT
Elevation
670 ft MSL
Control Tower
No
Fuel Types
None listed
Coordinates
39.0162, -90.3182
Current Weather
METAR KSET 221354Z AUTO 08010KT 10SM OVC020 18/12 A2997 RMK AO2 SLP145 T01780122
Flight Category
MVFR
Wind
80° at 10 kt
Visibility
10+ SM
Temperature
17.8°C
Dewpoint
12.2°C
Altimeter
1015.00 inHg
Cloud Cover
OVC
Nearest weather from KSET (8 NM away)
Observed 2026-05-22 13:54Z
Runways
| ID | Length | Width | Surface | Lights |
|---|---|---|---|---|
| 09/27 | 1,300 ft | 100 ft | TURF | - |
Active NOTAMs
No active NOTAMs for 01IS.
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Illinois airports
01IS Operational Overview
Location & Facility
William E. Koenig Airport (01IS) is a airport located in Dow, Illinois, United States. The field sits at an elevation of 670 feet above mean sea level (MSL) at coordinates 39.0162°N, 90.3182°W.
Runways
William E. Koenig Airport has 1 runway. The longest runway (09/27) measures 1,300 feet by 100 feet with a turf surface.
Communications & Operations
William E. Koenig Airport is a non-towered (pilot-controlled) field.
Current Conditions
The current flight category at William E. Koenig Airport is MVFR (Marginal VFR — reduced visibility or ceiling). Weather conditions are updated in real-time from official NOAA Aviation Weather Center observations.
Frequently Asked Questions
What is 01IS?
01IS is the ICAO identifier for William E. Koenig Airport, a public-use airport located in Dow, Illinois, United States.
How many runways does William E. Koenig Airport have?
William E. Koenig Airport (01IS) has 1 runway. See the runway table above for dimensions and surface types.
What is the elevation of 01IS?
The field elevation of William E. Koenig Airport is 670 feet above mean sea level (MSL).
Is fuel available at 01IS?
No fuel types are currently listed for William E. Koenig Airport. Contact the FBO directly for availability.
What are the current weather conditions at 01IS?
The current flight category at William E. Koenig Airport is MVFR. See the METAR section above for full decoded weather data including wind, visibility, temperature, and altimeter.
Are there active NOTAMs at 01IS?
There are currently no active NOTAMs for William E. Koenig Airport.
How do I access complete data for 01IS?
Sign up for a free AeroCopilot account to access all frequencies, full NOTAM text with AI interpretation, decoded forecasts, and IFR procedure charts for William E. Koenig Airport.
Where is William E. Koenig Airport located?
William E. Koenig Airport (01IS) is located in Dow, Illinois, United States, at an elevation of 670 ft MSL.