Seven Mile Bridge, Road bridge between Marathon and Little Duck Key, Florida Keys, US
The modern Seven Mile Bridge spans 6.79 miles across turquoise waters, connecting the Middle Keys to the Lower Keys at a height of 65 feet.
The original bridge, constructed from 1909 to 1912 under Henry Flagler's direction, formed part of the Florida East Coast Railway's extension to Key West.
The parallel old and new bridges represent different engineering periods, with the original structure listed on the National Register of Historic Places.
The concrete structure includes 440 spans and carries both the Florida Keys aqueduct and fiber optic cables, serving communities in the Lower Keys.
The bridge withstood multiple hurricanes since 1935, leading to its transformation from a railroad crossing to an automobile route connecting the Florida Keys.
Location: Florida
Official opening: May 24, 1982
Length: 10,887.5 m
GPS coordinates: 24.68194,-81.22389
Latest update: September 23, 2025 16:45
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