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Otterbach Farm Airport Private
81LL · Mendota, IL · 840 ft elevation · var 0E · Towered
Airport information
- FAA LID
- 81LL
- Coordinates
- 41.5723, -89.1714
- Elevation
- 840 ft MSL
- Magnetic variation
- 0E
- Sectional chart
- CHICAGO
- Airport use
- Private
- Control tower
- Yes
- ARTCC
- CHICAGO (ZAU)
- Flight service (FSS)
- KANKAKEE
- Attendance
- UNATNDD
- Segmented circle
- No
- Activated
- 1979/05
- Distance from city
- 2 NW
Weather
METAR observed
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TAF forecast
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Sun & FAA night 2026-06-20
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 04:48 AM | 09:48Z |
| Sunrise | 05:22 AM | 10:22Z |
| Sunset | 08:34 PM | 01:34Z |
| Evening civil twilight Loggable night begins | 09:08 PM | 02:08Z |
Loggable night (§1.1)
09:08 PM → 04:48 AM
Night currency (§61.57)
09:34 PM → 04:22 AM
Plan a flight from 81LL
Runway NW/SE
1,600 ft × 70 ft · Turf NW
- Heading
- n/a
- Traffic pattern
- Left
SE
- Heading
- n/a
- Traffic pattern
- Left
Nearby navigation aids
| NavAid | Type | Freq | Radial / Dist magnetic |
|---|---|---|---|
| PLL · Polo | VOR-DME | 111.20 | r143° / 28.4 NM |
| BDF · Bradford | VORTAC | 114.70 | r037° / 31.1 NM |
| JOT · Joliet | VORTAC | 112.30 | r271° / 38.4 NM |
| RFD · Rockford | VOR-DME | 110.80 | r177° / 39.2 NM |
VFR sectional
No published instrument procedures or Chart Supplement for 81LL. VFR sectional link above.
Ownership & management
Owner
DEAN L. OTTERBACH
35461 2900 NORTH AVE, MENDOTA, IL
815-538-7102
Manager
DEAN L. OTTERBACH
35461 2900 NORTH AVE, MENDOTA, IL
773-538-7102
Remarks FAA
- E111:PROVIDED ALL TRAFFIC PATTERN OPERATIONS ARE CONDUCTED NORTH OF THE RWY.
- OWNER DESIRES ARPT NOT BE CHARTED.
- FOR CD CTC CHICAGO ARTCC AT 630-906-8921.
- KEN OTTERBACK 35461 N 2900TH RD MENDOTA, IL 61342 (815) 538-7102
Nearby airports
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 81LL in a full tool: METAR/TAF decoder, crosswind calculator, sun & night times, or the density altitude calculator.