Spring Brook Airport
1LL2 · Seneca, IL · Print kneeboard
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Weather
METAR observed
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TAF forecast
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Sun & FAA night2026-08-04 · night begins 08:39 PM
| Event | Local (CDT) | UTC |
|---|---|---|
| Morning civil twilight Loggable night ends | 05:22 AM | 10:22Z |
| Sunrise | 05:52 AM | 10:52Z |
| Sunset | 08:08 PM | 01:08Z |
| Evening civil twilight Loggable night begins | 08:39 PM | 01:39Z |
Plan a flight from 1LL2
Winds aloft NOAA forecast · 3,000 to 53,000 ft
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Advisories
NOTAMs
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Pilot reports
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Airspace hazards
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Runways
RWY 18LEFT traffic
- Heading
- 180° true
- Dimensions
- 2,800 × 70 ft
- TPA
- 1,500 ft MSL (≈1,000 AGL) · standard
- Surface
- ASPH
Enter the left downwind (heading 000°) on the 45° at 1,500 ft MSL (≈1,000 AGL).
Pattern side: FAA NASR · TPA standard 1,000 ft AGL (not charted) · layout: schematic (headings + lengths)
Headings shown are true (magnetic variation unavailable).
| Runway | Length | Your margin |
|---|---|---|
| 18/36 | 2,800 ft |
Prefer one flat page? Full runway details for 1LL2 → · New to pattern entries? The 45° entry, explained → · Teaching here? Print the 1LL2 kneeboard →
Comms & NavAids
Nearby navigation aids
JOT 112.30 · DPA 114.55 · EON 113.20
| NavAid | Type | Freq · ch | Range | Radial / Dist magnetic |
|---|---|---|---|---|
| JOT · Joliet | VOR/DME | 112.30 · 70X | High | r222° / 20.5 NM |
| DPA · Dupage | VOR/DME | 114.55 · 92Y | Low | r198° / 37.6 NM |
| EON · Peotone | VORTAC | 113.20 · 79X | Low | r271° / 38 NM |
Charts & procedures
No published instrument procedures or Chart Supplement for 1LL2 — open it on the VFR sectional →
Airport info
Airport information
- FAA LID
- 1LL2
- Coordinates
- 41.3006, -88.6333
- Elevation
- 500 ft MSL
Detailed FAA facility data isn't available for this airport.
No published services or facility detail for 1LL2.
Nearby airports
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Also nearby: 67IL Mitchell Restricted Landing Area Airport (private) (3 NM) · 69IL David Gillespie Airport (private) (4 NM) · LL39 Curanda Airport (private) (7 NM) · IL68 Nettle Creek Landings Airport (private) (9 NM) · 8N2 Skydive Chicago Airport (9 NM) · 34IS Jim Wehrli Memorial Airport (9 NM)
About 1LL2
Spring Brook Airport (1LL2) is an airport in Seneca, IL, at 500 ft MSL. It has 1 runway, the longest 2,800 ft. This page shows live METAR/TAF weather, runway crosswinds, frequencies, navaids, and FAA charts for 1LL2, refreshed from the Aviation Weather Center and FAA NASR.
What is the longest runway at 1LL2?
Spring Brook Airport has 1 runway; the longest is 2,800 ft. See the Runways section for headings, surface, and lighting.
Where is 1LL2?
Spring Brook Airport is in Seneca, IL, at an elevation of 500 ft MSL. Coordinates: 41.3006, -88.6333.
Fly out of 1LL2 often?
Save 1LL2 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.
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 1LL2 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.