Fun Facts About the Seven Mile Bridge

1. It’s not actually seven miles long

Despite the name, the modern Seven Mile Bridge measures about 6.76 miles (10,888 meters) from end to end. The name is a holdover from the original bridge built for Henry Flagler’s Overseas Railway in 1912. Even though the exact length has changed, the “seven mile” moniker has stuck for over a century.

2. It replaced a converted railway bridge

The modern bridge, opened in 1982, replaced a much narrower span that began life as a railway trestle. After the 1935 Labor Day Hurricane damaged the railway, the structure was converted to carry motor vehicles as part of the Overseas Highway. Drivers on the old bridge often remember the open steel railings and the unnerving view straight down to the water.

3. Part of the iconic Overseas Highway

The Seven Mile Bridge is one of the crown jewels of the Overseas Highway (US-1), a 113-mile route that threads the Florida Keys together. The highway’s full length — from Key Largo to Key West — is recognized as an All-American Road, the highest designation in the US National Scenic Byways program.

4. One of the longest continuous bridges over water in the US

While there are longer bridges in the US, few offer such an extended run without significant land breaks. The Seven Mile Bridge’s nearly 7-mile expanse over open water ranks it among the longest continuous segment bridges in the country and the world.

5. A Hollywood favorite

The bridge has appeared in films such as True Lies (1994) and the James Bond movie Licence to Kill (1989), as well as commercials, documentaries, and music videos. Directors prize its cinematic lines and the immediate recognition it gives to any scene set in the Florida Keys.

6. The old bridge lives on — for pedestrians and cyclists

Portions of the Old Seven Mile Bridge have been preserved as recreational pathways, most notably the section leading to Pigeon Key. This restored segment lets visitors experience mid-bridge views without vehicle traffic — perfect for walking, biking, and photography.

7. A time-lapse superstar

On Instagram, TikTok, and YouTube, the bridge often stars in dashboard-mounted time-lapse videos. The steady forward motion and unbroken horizon make it ideal for short, shareable clips. In many cases, these viral posts inspire others to visit the Keys and recreate the shot.

8. Built to withstand strong currents and storms

Engineers designing the modern span had to account for powerful tidal currents between the Gulf of Mexico and the Atlantic. Precast, prestressed concrete box girders were chosen for strength and durability, and the bridge’s height provides about 65 feet (20 m) of clearance for marine traffic — an improvement over the old structure.

9. Connects two small Keys with outsized roles

The bridge links Knights Key (part of Marathon in the Middle Keys) to Little Duck Key in the Lower Keys. Knights Key serves as a hub for services, lodging, and tours, while Little Duck Key marks the gateway to Bahia Honda and beyond.

10. Sunrise and sunset crossings are legendary

Many travelers plan their drives to coincide with golden hour. At sunrise, the eastern horizon glows behind the bridge; at sunset, the sky ignites over the Lower Keys. Both times of day offer changing colors, long shadows, and fewer cars than midday.

Bonus trivia

• Local events, such as fun runs and charity rides, have occasionally used the bridge’s approaches and pedestrian sections.
• The water below shifts from emerald shallows to deep blue channels — a visible reminder of the Keys’ unique marine geography.
• In the early years of the modern bridge, its clean design won praise from engineers for balancing form and function in a scenic location.

Tips for spotting these facts on your visit

• Stop at designated overlooks to compare the old and new spans side by side.
• Bring a pair of binoculars to spot marine life and distant islands.
• Drive both directions if you can — perspectives change dramatically with the light.
• Check museum exhibits at Pigeon Key for historic photos and construction details.