Seven Mile Bridge

Seven Mile Bridge
Seven Mile Bridge with the original in the foreground
Coordinates	24°41′54″N 81°10′36″W / 24.6982°N 81.1767°W / 24.6982; -81.1767
Carries	2 lanes of US 1
Crosses	Moser Channel
Locale	Florida Keys, Monroe County, Florida
Maintained by	Florida Department of Transportation
ID number	900101
Characteristics
Design	Precast segmented box girder bridge
Total length	35,719.2 feet 6.765 miles (10.887 km)
Width	38 feet (12 m)
Longest span	135 feet (41 m)
Clearance below	65 feet (20 m)
History
Construction cost	$45 million[1] (equivalent to $120 million in 2023 dollars)
Opened	May 24, 1982
Location

The Seven Mile Bridge is a bridge in the Florida Keys, in Monroe County, Florida, United States. It connects Knight's Key (part of the city of Marathon, Florida) in the Middle Keys to Little Duck Key in the Lower Keys. Among the longest bridges in existence when it was built, it is part of the Overseas Highway in the Keys, which is part of the 2,369-mile (3,813 km) U.S. Route 1.^[1][2]

There are two bridges in this location. The modern bridge is open to vehicular traffic; the older one only to pedestrians and cyclists. The older bridge, originally known as the Knights Key-Pigeon Key-Moser Channel-Pacet Channel Bridge, was constructed from 1909 to 1912 under the direction of Henry Flagler and Clarence S. Coe as part of the Florida East Coast Railway's Key West Extension, also known as the Overseas Railroad.