- Airport Identifier
- IL38
- Airport Name
- J Maddock Airport
- Location
- Big Rock, United States
- Field elevation (ft)
- 705 ft
- Airport Type
- Small airport
- Magnetic Variation
- 3.101° E
- Coordinates
- 41.766998° N 88.531998° W
| Runway Name | Runway Length | Displaced Threshold (ft) | Runway Heading (°T) | Runway Heading (°M) | Slope | Surface |
|---|---|---|---|---|---|---|
| E | 2,600 ft x 70 ft | N/A | Unknown | Unknown | Unknown | Grass |
| W | 2,600 ft x 70 ft | N/A | Unknown | Unknown | Unknown | Grass |