Otterbach Farm Private
81LL · Mendota, IL · Non-towered · Print kneeboard · Open on the map
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Weather
METAR observed
TAF forecast
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Sun & FAA night2026-11-02 · night begins 05:19 PM
| Event | Local (CST) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 06:01 AM | 12:01Z |
| Sunrise | 06:30 AM | 12:30Z |
| Sunset | 04:50 PM | 22:50Z |
| Evening civil twilight Loggable night begins | 05:19 PM | 23:19Z |
Plan a flight from 81LL
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Full reports: nearest reporting station
Advisories
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Airspace hazards · Checking SIGMETs and G-AIRMETs…
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Runways
RWY NWLEFT traffic
- Heading
- 315° mag · 315° true
- Dimensions
- 1,600 × 70 ft
- TPA
- 1,800 ft MSL (≈1,000 AGL) · standard
- Surface
- Turf
Enter the left downwind (heading 135°) on the 45° at 1,800 ft MSL (≈1,000 AGL).
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: schematic (headings + lengths)
| Runway | Length | Your margin |
|---|---|---|
| NW/SE | 1,600 ft |
Prefer one flat page? Full runway details for 81LL → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 81LL kneeboard →
Comms & NavAids
Nearby navigation aids
BDF 114.70 · JOT 112.30
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| BDF · Bradford | TACAN | 114.70 · 94X | — | r037° / 30.9 NM |
| JOT · Joliet | VOR/DME | 112.30 · 70X | High | r270° / 38.5 NM |
Charts & procedures
No published instrument procedures or Chart Supplement for 81LL — open it on the VFR sectional →
Airport info
Airport information
- FAA LID
- 81LL
- Coordinates
- 41.5692, -89.1737
- Elevation
- 840 ft MSL
- Magnetic variation
- 0E
- Sectional chart
- CHICAGO
- Airport use
- Private
- Control tower
- No
- ARTCC
- CHICAGO (ZAU)
- Flight service (FSS)
- KANKAKEE · 1-800-WX-BRIEF
- Attendance
- UNATNDD
- Segmented circle
- No
- Activated
- 1979/05
- Distance from city
- 2 NW
Ownership & management 2 contacts
Remarks FAA · 3 notes
General
- OWNER DESIRES ARPT NOT BE CHARTED.
- FOR CD CTC CHICAGO ARTCC AT 630-906-8921.
Contact
- KEN OTTERBACK 35461 N 2900TH RD MENDOTA, IL 61342 (815) 538-7102
Nearby airports
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Also nearby: 35IL 7th Heaven (private) (2 NM) · IL22 Grandpa's Farm Mendota (private) (3 NM) · IL55 Younglove/Otterbach (private) (8 NM) · IL87 W Davis (private) (9 NM) · IL99 B & C (private) (9 NM) · 7LL7 Delhotal (private) (10 NM)
About 81LL
Otterbach Farm (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 is a non-towered (pilot-controlled) airport; use the published CTAF/UNICOM in the Comms & NavAids section.
What is the longest runway at 81LL?
Otterbach Farm has 1 runway; the longest is 1,600 ft. See the Runways section for headings, surface, and lighting.
Where is 81LL?
Otterbach Farm is in Mendota, IL, at an elevation of 840 ft MSL. Coordinates: 41.5692, -89.1737.
More about 81LL
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.
Something here wrong or out of date? Report a data problem.