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Four Mile Crib Lighthouse

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

Location & Light Range

About Four Mile Crib Lighthouse

Constructed in 1898, this lighthouse stands 9 meters above the water. Its focal height reaches 20 meters, projecting a white light. The structure first began its operation in 1898. It is located in Chicago, on Lake Michigan.

Light & Optic

Characteristic Signature
Fl W 15s
Flash Type
Flashing
Light Color
White
Flash Count
1 flash
Interval
15s
Focal Height
20m

Construction & History

Year Built
1898

References & Identifiers

Wikidata
Q82290501 →
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
9m

Location

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.