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Block Island Southeast Lighthouse

Fl G 5s🇺🇸Rhode Island, USInactive

Location & Light Range

About Block Island Southeast Lighthouse

Constructed in 1875, this lighthouse stands 16 meters tall with a focal height of nearly 80 meters. Its green tower was first lit in the same year it was built. The light emits a single white flash and has a geographic range of 20 nautical miles. The station is no longer operational.

Why it matters: This structure was added to the National Register of Historic Places in 1997, acknowledged for its architectural sophistication among 19th-century American lighthouses.

Background
Block Island Southeast Light is a lighthouse located on Mohegan Bluffs at the southeastern corner of Block Island, Rhode Island. It was designated a U.S. National Historic Landmark in 1997 as one of the most architecturally sophisticated lighthouses built in the United States in the 19th century.

Light & Optic

Characteristic Signature
Fl G 5s
Flash Type
Flashing
Light Color
Green
Flash Count
1 flash
Interval
5s
Raw Code
Fl
Focal Height
79.5m
Geographic Range
20NM

Construction & History

Year Built
1875
Heritage Status
National Register of Historic Places listed place

References & Identifiers

Admiralty No.
LLNR 640
Wikipedia
Read on Wikipedia →
Wikidata
Q4356900 →
OpenStreetMap
View on OSM →

Tower & Structure

Tower Height
16m
Tower Color
green

Location

City
Rhode Island
Country
🇺🇸US
Latitude
41.1534°
Longitude
-71.5522°

Nearby Vessels

Flag
Type
Name
Dist.
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Frequently Asked Questions

How do mariners identify Block Island Southeast Lighthouse at night?+
Block Island Southeast displays the characteristic Fl G 5s — 1 green flash every 5 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. The green color may indicate a specific sector or warning zone.
Which ports and harbors does Block Island Southeast Lighthouse guide vessels into?+
Block Island Southeast Lighthouse assists vessels approaching 5 nearby ports. The closest is BLOCK ISLAND at 1.3 NM to the N. Other ports served include LONG COVE & CAMPGROU (16.2 NM N), POINT JUDITH NORTH (16.6 NM N), South Kingstown (16.9 NM N), STONINGTON ON RIVER (17.2 NM NW). Mariners should consult the relevant chart for full approach and pilotage information.
Is Block Island Southeast Lighthouse still active and maintained?+
Block Island Southeast Lighthouse is currently listed as inactive. It may have been decommissioned, replaced by a different navigation aid, or temporarily taken out of service. Mariners should check the latest Notices to Mariners for current status.
What shipping routes pass near Block Island Southeast Lighthouse?+
Block Island Southeast Lighthouse is located within the US East Coast shipping lane — a major shipping corridor serving ports along the Atlantic seaboard of the United States. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Block Island Southeast Lighthouse?+
You can track vessels near Block Island Southeast 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.