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Alligator Reef

Location: 4 miles east of Indian Key near Islamorada, FL

Local Marine Forecast.

There are no active watches, warnings or advisories 

Latest Condiitions.

About Alligator Reef

The location of the light is 4 miles east of Indian Key. The nearest city is Islamorada, FL. The station was first established in 1873. The current lighthouse was first lit in 1873.

The lighthouse is a white octagonal pyramid skeleton tower.

The tower has a flashing white light at a focal plane height of 136 ft above mean high water. The light has a nominal range of 16 nautical miles. The tower height is 136 ft. The light has a period of 60 seconds.

Open to the Public?: No    Active?: Yes

Identification number: 980 (U.S.)

The lighthouse warns ships of a submerged reef. The lighthouse was automated in 1963.

Red from 223 to 249 and 047 0.2s fl 29.8s ec. to 068. RACON: G ( ).

0.2s fl 29.8s ec.
0.2s fl 9.8s ec.
0.2s fl 9.8s ec.
0.2s fl 9.8s ec.
(2R sectors)

A 'flashing' light is a light in which the total duration of light in a period is shorter than the total duration of darkness and the appearances of light (flashes) are usually of equal duration. So in the 60 second period, the light is on for less than 30 then off for more than 30.

NOTE: Sectors of colored glass are placed in the lanterns of some lights in order to produce a system of light sectors of different colors. In general, red sectors are used to mark shoals or to warn the mariner of other obstructions to navigation or of nearby land. Such lights provide approximate bearing information, since observers may note the change of color as they cross the boundary between sectors.
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