Boca Grande Causeway, Causeway in Charlotte County, Florida, USA

The Boca Grande Causeway is a 2.5-mile (4 km) causeway in Charlotte County, Florida, crossing Gasparilla Sound between Placida on the mainland and Boca Grande on Gasparilla Island. It is made of three bridges: a northern swing bridge and two fixed-span bridges in the centre and south. It is the island's only vehicular access.

The Boca Grande Causeway opened in 1958 after six years of construction, replacing a vehicle ferry service to Gasparilla Island. It was built privately and sold in 1998 to the Gasparilla Island Bridge Authority, a government agency created to oversee its operation. The original bridges were replaced in 2013 and 2015 because of their age and functional obsolescence.

The causeway was built parallel to the tracks of the Charlotte Harbor and Northern Railway, whose passenger service to the island ended shortly after the road opened in 1958. The railroad was abandoned in 1981, but its trestles remain largely intact and can be seen from the roadway.

Vehicles must pay a toll to access the island, with different rates depending on the vehicle type. The drive across is relatively brief, but conditions can vary depending on weather and tidal flow patterns.

The northern section features a swing bridge spanning about 213 feet (65 meters) over the navigation channel, making it one of the few operational swing bridges in Florida. This moving structure is a rare engineering feature that visitors might observe while crossing.