5 Longest Bridges in the United States 

Lake Pontchartrain Causeway, Louisiana (23.83 miles) 

This bridge holds the title of the longest bridge in the United States and the world over water (continuous). It's a series of parallel bridges connecting Metairie and Mandeville, Louisiana, spanning the massive Lake Pontchartrain.  

Manchac Swamp Bridge, Louisiana (23 miles) 

Located on Interstate 10, this bridge stretches across the Manchac Swamp, a vast wetland area, making it the longest bridge on the Interstate Highway System.  

Atchafalaya Basin Bridge, Louisiana (18.2 miles) 

This bridge carries U.S. Route 90 across the Atchafalaya Basin, a vast wetland system. It's another contender for the title of longest bridge in Louisiana.  

Chesapeake Bay Bridge-Tunnel, Virginia (17.6 miles)  

This unique structure combines a bridge section over open water with a tunnel section that dives under the Chesapeake Bay. It connects Virginia Beach with Virginia's Eastern Shore.  

I-10 Bonnet Carré Spillway Bridge, Louisiana (11 miles) 

This bridge carries Interstate 10 over the Bonnet Carré Spillway, a flood-control structure on the Mississippi River.