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Four Mile Crib Lighthouse

Fl W 15s🇺🇸Chicago/Lake Michigan, IL, USOperational

Location & Light Range

About Four Mile Crib Lighthouse

Four Mile Crib Lighthouse is a maritime navigation aid located in Chicago/Lake Michigan, IL, US. It is currently operational and active, providing guidance to vessels navigating the surrounding waters. The light sits at a focal height of 20 meters above mean sea level.

Light characteristic: The identifying signal of this lighthouse is Fl W 15s. This means the light produces 1 flash every 15 seconds. Mariners use this distinctive pattern to positively identify the light and distinguish it from other aids to navigation in the area. The light displays a white signal, the most common color for major coastal lights.

Position: Four Mile Crib Lighthouse is positioned at 41.8667°N, 87.5500°W, near Chicago/Lake Michigan, IL in US.

Geographic context: Four Mile Crib Lighthouse is situated on the North Pacific Ocean. The location falls within the temperate maritime climate zone.

Nearby lighthouses in US: Other lighthouses in the region include Abagadasset Point Range, Absecon, Admiralty Head Light, Ahukini Breakwater, Alameda County (Oakland Area) Lighthouses. View all on the Lighthouses Directory.

Nearby Ports

Chicago

USCHI

2.8 NMWNW

Wicker Park

USWCP

5.6 NMWNW

Calumet

USCLH

8.1 NMS

CALUMET HARBOR

USOUS

8.3 NMS

Stickney

USSKT

10.1 NMWSW

Flash Characteristics

Characteristic Signature
Fl W 15s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
15s

Physical Specifications

Focal Height
20m
Light Range
Not available
Status
ACTIVE
City
Chicago/Lake Michigan, IL
Country
🇺🇸US
Latitude
41.8667°
Longitude
-87.5500°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Four Mile Crib Lighthouse at night?+
Four Mile Crib displays the characteristic Fl W 15s — 1 white flash every 15 seconds. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area.
Which ports and harbors does Four Mile Crib Lighthouse guide vessels into?+
Four Mile Crib Lighthouse assists vessels approaching 5 nearby ports. The closest is Chicago at 2.8 NM to the WNW. Other ports served include Wicker Park (5.6 NM WNW), Calumet (8.1 NM S), CALUMET HARBOR (8.3 NM S), Stickney (10.1 NM WSW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Four Mile Crib Lighthouse still active and maintained?+
Yes, Four Mile Crib Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
How can I track vessels near Four Mile Crib Lighthouse?+
You can track vessels near Four Mile Crib Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.