Henry Flagler’s railroad bridges connecting Knights Key to Little Duck Key were four distinct bridges: Knights Key Bridge (6,803 feet), Pigeon Key Bridge (5,935 feet), Moser Channel Bridge (13,947 feet), and the Pacet Channel Viaduct (9,035 feet). During the railroad years, it was not called the Seven Mile Bridge.
The first three sections, Knights Key, Pigeon Key, and Moser Channel were built using concrete piers reinforced with ¾ inch steel rods. Steel girders, 80 feet long and weighing 41.5 tons, were lowered across the piers to create the foundation on which the railroad tracks were later attached. The fourth section, the Pacet Channel Viaduct, utilized a series of arches to support the tracks. Like the Jewfish Creek Bridge, a swing bridge was built into the Moser Channel section to allow for boat traffic using the shipping channel.
After the 1935 Labor Day Hurricane, the bridges were widened and converted into an automobile bridge. It was celebrated as the Seven Mile Bridge when it reopened in 1938. In 1982, the old bridge was closed, and the modern Seven Mile Bridge opened to traffic. At 35,867 feet in length, it falls 1,083 feet short of seven miles.
Fun Fact: Local celebrity Fred the Tree grows on the old Pacet Channel Viaduct. Fred has his own social media pages and was featured in the 2024 movie Road House starring Jake Gyllenhaal.