New How Long Is The Lake Pontchartrain Causeway Background. The longer of the two bridges is 23.83 miles (38.35 km) long. It covers an area of 630 square miles (1,600 km2) with an average depth of 12 to 14 feet (3.7 to 4.3 m).
Now the lake pontchartrain causeway is the longest bridge over water (continuous) while the jiaozhou bay bridge is the lake pontchartrain causeway's title will probably stay safe for at least a few years to come, if not decades.
The causeway bridge runs 23 miles over the lake and is the longest bridge over water in the world! Lake pontchartrain causeway is an automotive attraction in new orleans. It's the closest thing to being at sea on four. Opened to the public in 1956 and the second in 1969.