Old Seven Mile Bridge

Use the Old Seven Mile Bridge parking area off Knights Key Boulevard on the Marathon end. It has space for about 35 vehicles, and the bridge entrance is a short walk from the lot. Follow the pedestrian span west across the water to Pigeon Key, then come back the same way. The map draws the bridge corridor once; your distance includes the return. Don't continue along the apparent old bridge beyond Pigeon Key as though it were a through-route. The restored public walk ends at the island approach. Entering Pigeon Key is a separate visit with its own admission and access arrangements, so check those before planning to go beyond the bridge landing.

The old and new bridges run nearly east to west, and the open water gives you a wide view in both directions. Look back toward Marathon to see how the two bridges track together; approaching Pigeon Key, the island's palms and historic buildings come into view at the end of the long straight span. Rays, turtles, dolphins and seabirds are possible sightings, but the elevated bridge doesn't make marine life easy to spot every time. If the light is good, frame the island with the newer bridge behind it to show the two generations of crossing in one view.

Pigeon Key was a work base for the Florida Keys railroad and once housed about 400 people building it. The bridge is one of the surviving pieces of Flagler's Overseas Railway, and the restored pedestrian access reopened in 2022 after a major rehabilitation. That history gives the crossing a destination beyond the view: you're walking to a small island that helped make the railway possible, not just to an arbitrary turnaround point.

There is little shade on the bridge, so sun and wind matter more than climbing. Carry water for the full return and take care of restroom needs in Marathon; dependable public facilities along the crossing aren't confirmed. The nearby 7 Mile Grill is a separate stop on the Marathon side, not a bridge amenity. Pets aren't allowed on Pigeon Key, but the bridge's own pet rule wasn't established, so check before bringing one. The bridge-specific pet policy is why this guide leaves the app's pet field unknown.