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Key West in Monroe County, Florida — The American South (South Atlantic)
 

Mariners Beware!

Fort Jefferson

— Dry Tortugas National Park —

 
 
Mariners Beware! Marker image. Click for full size.
Photographed by Brandon D Cross, May 4, 2023
1. Mariners Beware! Marker
Inscription. The Dry Tortugas offer a sheltered harbor for ships, but their reefs and shoals have claimed more than 200 wrecks since the 1500s. To warn mariners, the US government built a 70-foot lighthouse in 1825—26 on Garden Key 20 years before work started on the fort. Shipwrecks continued. The light was not tall or bright enough and was too far away from the hazards. In 1858 a new 152-foot Lighthouse, with a powerful Fresnel lens, was built three miles to the west on Loggerhead Key. Damaged by hurricanes, the Garden Key Light was replaced in 1876 by the iron-plate lighthouse currently atop the fort. Iron was used because bricks could shatter if hit by enemy fire and send debris flying into the fort.<

(captions)
The foundations of the original whitewashed-brick Garden Key Light can be seen on the parade ground.

A 2008 nautical chart of Tortugas Harbor

Look for the Dry Tortugas Light three miles west on Loggerhead Key.

Tortugas Harbor Light (foreground).

 
Erected by National Park Service, U.S. Department of the Interior.
 
Topics and series. This memorial is listed in these topic lists: Communications
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Forts and CastlesParks & Recreational AreasWaterways & Vessels. In addition, it is included in the Lighthouses series list. A significant historical year for this entry is 1825.
 
Location. 24° 37.687′ N, 82° 52.325′ W. Memorial is in Key West, Florida, in Monroe County. It can be reached from no nearby street. This marker is located within Fort Jefferson, Dry Tortugas National Park. Touch for map. Memorial is at or near this postal address: Fort Jefferson - Key West, Key West FL 33040, United States of America. Touch for directions.

Regionally, this memorial is on the Florida Keys. It is also in the American South and on the Gulf Coast. Globally, it is in the North Atlantic Region, North America, a Gulf of Mexico state, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Spain, the territory of the Mississippian Culture, one of the Confederate States of America, and the Antebellum South.

Other nearby markers. At least 8 other markers are within walking distance of this marker: Makeshift Living Quarters (within shouting distance of this marker); The Dry Tortugas, Home to a Myriad of Life
Mariners Beware! Marker image. Click for full size.
Photographed by Brandon D Cross, May 4, 2023
2. Mariners Beware! Marker
(within shouting distance of this marker); Deadly Crossfire (within shouting distance of this marker); Intricate Gun Rooms (within shouting distance of this marker); Touring Fort Jefferson (within shouting distance of this marker); Dr. Mudd's Cell (within shouting distance of this marker); Rifled Cannon (within shouting distance of this marker); Water in "Dry" Tortugas (within shouting distance of this marker). Touch for a list and map of all markers in Key West.
 
Also see . . .
1. Tortugas Harbor Light. (Submitted on June 3, 2023, by Brandon D Cross of Flagler Beach, Florida.)
2. Dry Tortugas National Park. (Submitted on June 3, 2023, by Brandon D Cross of Flagler Beach, Florida.)
 
 
Credits. This page was last revised on June 7, 2023. It was originally submitted on June 3, 2023, by Brandon D Cross of Flagler Beach, Florida. This page has been viewed 301 times since then and 38 times this year. Photos:   1, 2. submitted on June 3, 2023, by Brandon D Cross of Flagler Beach, Florida. • Bernard Fisher was the editor who published this page.
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Jul. 13, 2026