Most bridges are forgotten almost as soon as they are crossed. A few seconds across the river, a glimpse through the window, and the journey continues. America’s longest bridge is in a different category entirely. The structures stretch for miles across open water, wetlands and vast coastal landscapes, with roads that appear to be disconnected from the surrounding land. In some cases, drivers stayed on the bridge for so long that the coastline disappeared from view entirely. Not surprisingly, Louisiana dominates the rankings. The state’s geography is a patchwork of bays, swamps and swamps, leaving engineers with no choice but to build roads over the water. These bridges tell the story not just of transportation, but of the landscape that makes them necessary.According to WorldAtlas, some of the longest bridges in the United States are more than simple river crossings. Spanning lakes, bays, marshes and coastal wetlands, these massive structures can carry motorists for miles in areas where conventional roads would be difficult, if not impossible, to build. Louisiana dominates the rankings with its extensive network of marshes and waterways, and the state is home to some of the longest bridges. Check out the 10 longest bridges in the United States below.
America’s longest bridge: 10 longest bridge intersection From Lake Pontchartrain Causeway to San Mateo-Hayward Bridge
rank
|
bridge
|
length |
| 1 |
Lake Pontchartrain Causeway |
23.83 miles (38.35 kilometers) |
| 2 |
Manchak Swamp Bridge |
22.8 miles (36.7 kilometers) |
| 3 |
Louisiana Airborne Memorial Bridge (Atchafalaya Basin Bridge) |
18.2 miles (29.29 kilometers) |
| 4 |
Chesapeake Bay Bridge Tunnel |
17.6 miles (28.32 kilometers) |
| 5 |
Bonny Carey Spill Bridge |
11 miles (17.7 km) |
| 6 |
Louisiana Route 1 Bridge |
8.26 miles (13.29 kilometers) |
| 7 |
jubilee avenue |
7.5 miles (12.1 km) |
| 8 |
San Mateo-Hayward Bridge |
7 miles (11.27 km) |
| 9 |
seven mile bridge |
6.79 miles (10.78 km) |
| 10 |
WK General Wilson Bridge |
6.08 miles (9.78 km) |
Ranking of the longest bridges in the United States From Chesapeake Bay to Lake Pontchartrain
Lake Pontchartrain Causeway
Nowhere else in the country can rival the scale of the Lake Pontchartrain Causeway. It is nearly 24 miles long and spans the wide waters of Lake Pontchartrain, connecting the communities of Mandeville and Metairie on both sides of the lake.Drivers are surrounded by water for most of the crossing and have little idea of how far they have traveled or how much distance lies ahead. The first bridge opened in the 1950s, while the second parallel bridge was built more than a decade later to accommodate the growing traffic volume. The structure is internationally renowned for its long record as the world’s longest continuous bridge over water, a distinction it still retains in its specific category.
manchak swamp bridge
Not far from the causeway is the Manchak Swamp Bridge, another of Louisiana’s giant bridges. It carries Interstate 55 through a vast swamp system for nearly 23 miles, passing through cypress trees, waterways and marshlands.The bridge forms an important part of the interstate itself. Travelers traveling between New Orleans and Jackson often cross this road without realizing how much elevation the route has above the wetlands. Over the years, local folklore has given many stories to the area, giving the ferry a reputation beyond engineering and transportation.
Louisiana Airborne Memorial Bridge
The Louisiana Airborne Memorial Bridge is known to most as the Atchafalaya Basin Bridge. It cuts across the largest river swamp in the United States and forms a key stretch of Interstate 10 between Baton Rouge and Lafayette.Driving through it offers an ever-changing landscape of waterways, forests and floodplains. Rather than being made up of a single uninterrupted structure, sections of the intersection are made up of parallel spans that come together at key points along the route. Since its opening in the early 1970s, it has become one of the most heavily used long bridges in the country.
Chesapeake Bay Bridge Tunnel
PC:Official website
Virginia’s Chesapeake Bay Bridge-Tunnel is unique. Unlike most bridges on this list, it combines elevated road and underwater tunnel sections.The route crosses the mouth of the Chesapeake Bay and provides a direct connection between Virginia’s east coast and the Hampton Roads region. At some points, motorists exit the bridge and descend underwater, then reappear on another elevated section. This arrangement allows large vessels to move freely within the shipping channel while maintaining continuous road connections. The result feels less like a bridge and more like a collection of carefully stitched engineering solutions.
Bonny Carey Spill Bridge
Interstate 10 appears repeatedly in Louisiana’s long-distance bridge network, and the Bonny Carey Spill Bridge is another example. It stretches about 11 miles, passing wetlands, flood control infrastructure and parts of Lake Pontchartrain’s western edge.Its location is closely linked to the Mississippi River. During periods of unusually high water levels, the spillway below can divert excess river water towards the lake, helping to reduce the risk of flooding elsewhere. The bridge actually sits atop one of the region’s most important flood management systems.
Louisiana Route 1 Bridge
Computer: HNTB
Further south, the Louisiana Highway 1 Bridge carries traffic to Port Fourchon, one of the Gulf Coast’s major industrial centers. The elevated road was developed in part because the low-lying roads it replaced faced continued flooding and land subsidence.The ferry rises over eight miles above the marsh and waterway. In states where coastal erosion remains a concern, infrastructure often needs to adapt to the changing landscape. This bridge reflects this reality perhaps more clearly than most.
jubilee avenue
The first occurrence outside Louisiana was in neighboring Alabama. Jubilee Parkway spans Mobile Bay and is part of the Interstate 10 route through the area.Residents often refer to it simply as the Bayway. The bridge has become a daily icon for commuters between Mobile and the communities on the east side of the bay. Its official name comes from a local natural event known as the “Jubilee,” in which marine life abnormally gathers near the coast under certain environmental conditions.
San Mateo-Hayward Bridge
California’s longest bridge spans the San Francisco Bay. The San Mateo-Hayward Bridge directly connects the East Bay to the San Francisco Peninsula, carrying thousands of vehicles across approximately seven miles of water every day.Most structures remain low and close to the bay surface. The road then climbs suddenly to a higher section, allowing boats to pass underneath. This change in elevation breaks up the otherwise very flat intersection and provides wide views of the surrounding coastline.
seven mile bridge
Despite its famous name, the Seven Mile Bridge is just shy of a full seven miles. It remains one of the most recognizable highway bridges in the United States and an iconic feature of the Florida Keys.This modern bridge opened in the 1980s, replacing an old railway structure, part of which still remains next to it. Open water surrounds the road for much of the trip, creating one of the most unique driving experiences in North America. Filmmakers have long admired the scene, using the bridge in several major productions over the years.
WK General Wilson Bridge
Back in Alabama, the General WK Wilson Jr. Bridge spans more than six miles across the Mobile-Tensow Delta. The area has one of the largest wetland systems in the country, necessitating elevated transportation routes.Its double-arch design stands out in the flat delta landscape. Although the bridge’s official name honors an engineer and military officer, many locals use a more informal nickname based on the appearance of its paired arches.
