<Tr> <Th> Opened </Th> <Td> May 24, 1982 </Td> </Tr> <Tr> <Td_colspan="2"> Location in Florida </Td> </Tr> <P> 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 U.S. Route 1 . </P> <P> 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 . </P>

Where is the 7 mile bridge located in florida