Spring Brook Airport

1LL2 · Seneca, IL · 500 ft elevation

Overview Weather Runways Comms & NavAids Charts Services & 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.

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	04:47 AM	09:47Z
Sunrise	05:21 AM	10:21Z
Sunset	08:31 PM	01:31Z
Evening civil twilight Loggable night begins	09:05 PM	02:05Z

Loggable night (§1.1)

09:05 PM → 04:47 AM

Night currency (§61.57)

09:31 PM → 04:21 AM

Plan a flight from 1LL2

Destination (ICAO)

TAS (kt)Burn (gph)Reserve (hr)Wind from (°)Wind (kt)

Traffic pattern

Landing runway

LEFT traffic

Landing: Rwy 18
Pattern: left (turns left)
TPA: 1,500 ft MSL (≈1,000 AGL)

Enter the left downwind for Rwy 18 at 1,500 ft MSL (≈1,000 AGL) on a 45°. TPA estimated at 1,000 ft AGL (not charted for this field).

Runway 18/36

2,800 ft × 70 ft · ASPH

Heading: n/a

Heading: 351° true

Headings shown are true (magnetic variation unavailable).

Will it fit? Your aircraft's required runway length (from the POH) — checked against every runway here

ft · ≥1.5× comfortable, under 1.25× tight · saved across airports

Runway	Length	Your margin
18/36	2,800 ft

Nearby navigation aids

NavAid	Type	Freq	Radial / Dist magnetic
JOT · Joliet	VORTAC	112.30	r222° / 20.5 NM
PNT · Pontiac	VOR-DME	109.60	r006° / 29.1 NM
DPA · Du Page	VOR-DME	108.40	r198° / 37.6 NM
IKK · Kankakee	VOR-DME	111.60	r291° / 37.9 NM
EON · Peotone	VORTAC	113.20	r271° / 38 NM

VFR sectional

Open 1LL2 on the VFR sectional (SkyVector) ↗

No published instrument procedures or Chart Supplement for 1LL2. VFR sectional link above.

No published services or facility detail for 1LL2.

Nearby airports

67IL · Mitchell Restricted Landing Area AirportPrivate (3 NM)69IL · David Gillespie AirportPrivate (4 NM)LL39 · Curanda AirportPrivate (7 NM)IL68 · Nettle Creek Landings AirportPrivate (9 NM)8N2 · Skydive Chicago Airport (9 NM)34IS · Jim Wehrli Memorial Airport (9 NM)

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.

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 tab 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?

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