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
- No
- 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 2026-06-21
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 04:48 AM | 09:48Z |
| Sunrise | 05:23 AM | 10:23Z |
| Sunset | 08:34 PM | 01:34Z |
| Evening civil twilight Loggable night begins | 09:08 PM | 02:08Z |
Plan a flight from 81LL
Traffic pattern
- Landing
- Rwy NW
- Pattern
- left (turns left)
- TPA
- 1,800 ft MSL (≈1,000 AGL)
Enter the left downwind for Rwy NW at 1,800 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).
Runway NW/SE
1,600 ft × 70 ft · Turf- Heading
- n/a
- Traffic pattern
- Left
- Heading
- n/a
- Traffic pattern
- Left
| Runway | Length | Your margin |
|---|---|---|
| NW/SE | 1,600 ft |
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
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. Planning from here? Find the nearest airport with fuel or an approach, or check whether an IFR alternate is required.
About 81LL
Otterbach Farm Airport (81LL) is an airport in Mendota, IL, at 840 ft MSL. It has 1 runway, the longest 1,600 ft, with no control tower (pilot-controlled). This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 81LL, refreshed from the Aviation Weather Center and FAA NASR.
Does 81LL have a control tower?
No. Otterbach Farm Airport is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM on the Comms & NavAids tab.
What is the longest runway at 81LL?
Otterbach Farm Airport has 1 runway; the longest is 1,600 ft. See the Runways tab for headings, surface, and lighting.
Where is 81LL?
Otterbach Farm Airport is in Mendota, IL, at an elevation of 840 ft MSL. Coordinates: 41.5723, -89.1714.
Fly out of 81LL often?
Save 81LL 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.