Florida Keys' Longest Bridge: The Seven Mile Bridge (2006)

As of 2006 (and still today), the Seven Mile Bridge is the longest bridge in the Florida Keys. It spans 6.79 miles (10.93 km) between Knight's Key (Marathon) and Little Duck Key in the Middle Keys.

Key Facts

• Part of: US Highway 1 (Overseas Highway).
• Opened: 1982 (current box-girder bridge); replaced 1912 Flagler Railroad bridge (sections remain as fishing piers).
• Structure: Segmental concrete box girder; 84 spans; max clearance 65 ft.
• Iconic status: Featured in films (True Lies, 2 Fast 2 Furious); annual Seven Mile Bridge Run (April).

The Overseas Highway includes 42 bridges total; the next longest are the Long Key Bridge (2.3 mi) and the Channel Five Bridge (1.2 mi). The Seven Mile Bridge remains the engineering centerpiece of the 113-mile island chain connection.