Old Bahia Honda Bridge Trail

Start at the interpretive signs near the Calusa-area marina parking. The path follows the old road grade through a strip of coastal vegetation. Its climb is gradual until the staircase takes you up onto the bridge. Expect gravel underfoot at the approach and a hard concrete surface on the deck; the steps are the main effort, not the distance. There is no loop or separate easy continuation: once the fence marks the end, turn around the way you came. Don’t pass or climb around the barrier; the old deck beyond it is closed.

The bridge puts you higher than the beach and opens a wide look over the island, the shoreline, and the marina. Watch the water below as well as the horizon. In calm conditions, rays or fish can be visible; sea turtles sometimes swim beneath the span. They’re possibilities, not guaranteed sightings. The strongest picture from the high point takes in the pale sweep of beach and water, with a bit of deck or railing in the foreground to show that you’re looking out from the bridge.

This structure began as part of Henry Flagler’s Overseas Railroad, built to carry trains to Key West. The deep channel here called for steel trusses, unlike the concrete arches used on many other railroad spans in the Keys. Construction ran from 1904 to 1912; the first train reached Key West in January 1912. Standing on the walkway, you’re above the old rail structure rather than on the original railbed.

The 1935 hurricane badly damaged the rail line, and repairs took years. Florida later placed a concrete road deck over the rail bridge to carry U.S. 1, layering a highway above the older railway structure. The modern highway now runs nearby, while this remnant stops short of its former full crossing. The remaining span and its approach are why this is a short viewpoint walk rather than a route between islands. If you want to see the steelwork from below, the separate Bahia Honda Beach Walk passes under or beside the bridge; it’s a different stop, not part of this 0.4-mile hike.

Park in the main marina parking area at the end of the park road; the bridge trailhead and its signs are a short walk from there. Restrooms are in the Calusa day-use area, and the park concession sells sandwiches and snacks elsewhere in the park. There is no food stop along the bridge walk. Park admission is required. I couldn’t verify whether dogs are allowed on this specific route under the park’s designated-area rules, so check with the park before bringing one.