<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> <P> After the railroad was damaged by the Labor Day Hurricane of 1935, the line was sold to the United States government, which refurbished Seven Mile Bridge for automobile use . Unsupported sections were added in 1935 to widen it for vehicular traffic . Dismantled trackage was recycled, painted white, and used as guardrails . It had a swing span to allow passage of boats in the Moser Channel of the Intracoastal Waterway, near where the bridge crosses Pigeon Key, a small island that held a work camp for Flagler's railroad . Hurricane Donna in 1960 caused further damage . </P> <P> The current road bridge was constructed from 1978 to 1982 . </P> <P> The vast majority of the original bridge still exists, although the swing span has been removed . The 2.2 - mile section to Pigeon Key, used as a fishing pier and long open to motorized vehicles to give access to the key, was closed to motorized traffic in 2008 after the unsupported sections began to sag . As of 2015, the section remains open to pedestrians and bicyclists . In 2014, Florida Department of Transportation approved a $77 million plan to restore the old bridge . </P>

How long did it take to build the 7 mile bridge in the keys