Discover the 6 Longest Bridges in Louisiana

When you think of Louisiana, what comes to mind? Louisiana is known for its delicious Cajun food, jazz music, and Mardi Gras, but did you know that it also contains six of the longest bridges in the country? For those who enjoy bridges, Louisiana has some amazing views, ranging from a massive 24-mile span over Lake Pontchartrain to a small, 5.4-mile memorial bridge constructed just 17 years ago. Learn more about the six longest bridges in Louisiana and how they compare to other bridges in the US by continuing to read.

From Jazz to Jambalaya: Louisiana’s Unique Cultural Ambiance

Six of the country’s longest bridges may be found in Louisiana. Nevertheless, such boasting rights are frequently eclipsed by the indisputable heart and soul that are associated with this southern region. The people, sites, and activities of this melting pot of African, French, American, and French-Canadian cultures are as varied as the gumbo recipes made by each Southern family. The airboat trips that zoom through the bayou or the crazy celebrations of Mardi Gras, Louisiana, have also earned a badge of valor and tenacity after rebuilding after Hurricane Katrina tore through its streets, even if we usually think favorably of the music and laughter that envelops Bourbon Street.

Types of Bridges

Bridges come in a wide variety of forms all around the world. But based on the list below, it seems that just a few are strong enough to endure the engineering difficulties needed to maintain highways over longer distances. It is surprising to learn that the six longest bridges in Louisiana are classified as either trestle or beam bridges. The fact that trestle bridges aren’t thought to be among the most often constructed bridges is even more startling! What then are beam and trestle bridges?

Trestle Bridges

Throughout the whole width of the waterway, trespass bridges are constructed utilizing closely spaced frames. What gives the bridge its steady support are these stiff structures, called trestles. Typically, the trestles are composed of steel, iron, wood, and occasionally concrete.

Beam Bridges

One of the more well-known bridge types to engineers is the beam bridge, which is also referred to as a stringer bridge. Known as “I” beams because of its “I” shape, several support beams are used in this construction method to support the bridge deck, making it one of the simplest types of bridges.

The 6 Longest Bridges in Louisiana

There are six noteworthy bridges that span Louisiana’s boundaries, connecting the state’s superb transportation infrastructure to its soulful cuisine and celebrations. These buildings vary in length from an astounding 24 miles to a still-impressive 5.4 miles. The southeast region of the state is home to all six of these amazing bridges.

1. Lake Pontchartrain Causeway

Length: 23.875 miles

Bridge Type: Trestle

Built: 1956 (southbound), 1969 (northbound)

Location: Lake Pontchartrain

Longest Bridge in the United States

Not only is the Lake Pontchartrain Causeway the longest bridge in Louisiana, but it’s the longest bridge in the entire country. It is presently regarded as the world’s longest continuous span over water, according to the Guiness World Records! The fact that this bridge is made up of two parallel road bridges makes it extra stunning.

2. Manchac Swamp Bridge

Length: 22.8 miles

Bridge Type: Trestle

Built: 1979

Location: Manchac Swamp

2nd Longest Bridge in the United States

The Manchac Swam Bridge, Louisiana’s second-longest bridge, is quite near to the Lake Pontchartrain Causeway in terms of both length and location! The Manchac Swamp Bridge, which is little under 23 miles long and less than an hour’s drive apart, is a close second on the list. The Manchac Swamp can be safely crossed by Interstate 55 and U.S. Route 51 thanks to its twin concrete trestle bridge.

3. Atchafalaya Basin Bridge

Length: 18.2 miles

Bridge Type: Beam

Built: 1973

Location: Atchafalaya Basin

Connects Baton Rouge and Lafayette

3rd Longest Bridge in the United States

After being finished in the 1970s, the Atchafalaya Basin Bridge was the second-longest bridge in the United States, but it is now ranked third. This construction, which is also known as the Louisiana Airborne Memorial Bridge, consists of two parallel spans. This beam bridge, which carries Interstate 10 over the Atchafalaya Basin and links the cities of Baton Rouge and Lafayette, reaches an amazing 18.2 miles in length.

4. I-10 Bonnet Carré Spillway Bridge

Length: 11 miles

Bridge Type: Trestle

Year Built: 1972

Location: Bonnet Carré Spillway, Lake Pontchartrain, and LaBranche Wetland

Connects New Orleans and Baton Rouge

5th Longest Bridge in the United States

The I-10 Bonnet Carré Spillway Bridge carries Interstate 10 traffic, just as our third-place submission. But this bridge, which crosses many bodies of water, including Lake Pontchartrain, is the first on our list to do so. The I-10 Bonnet Carré Spillway Bridge crosses both the LaBranche Wetland and the Bonnet Carré Spillway in addition to this enormous lake. The 11-mile span that links Baton Rouge and New Orleans is made up of twin concrete trestle bridges.

5. Louisiana Highway 1 Bridge

Length: 8.257 miles

Bridge Type: Trestle

Year Built: 2009

Location: Bayou Lafourche and Marshes

Connects Leeville to Port Fourchon

6th Longest Bridge in the United States

The Gateway to the Gulf Express, also known as Louisiana Highway 1 Bridge, is a component of The LA 1 Improvement Project, which aims to link Grand Isle, Leeville, Golden Meadow, and Port Fourchon. In particular, this concrete trestle bridge connects the southern Louisiana bay region, allowing traffic to flow between Leeville and Port Fourchon. This bridge spans various marshes and Bayou Lafourche in a little more than eight kilometers.

6. Frank Davis “Naturally N’Awlins” Memorial Bridge

Length: 5.4 miles

Bridge Type: Trestle

Year Built: 2010

Location: Lake Pontchartrain

Connects New Orleans to Slidell

12th Longest Bridge in the United States

The Frank Davis “Naturally N’Awlins” Memorial Bridge, also known as the I-10 Twin Span Bridge, is a 5.4-mile long bridge that once more spans Lake Pontchartrain. The two parallel trestle bridges, which link Slidell and New Orleans, are the most recent constructions on this list. The original I-10 Twin Span Bridge, which had sustained significant damage from Hurricane Katrina five years earlier, was replaced by this memorial bridge, which was opened in 2010. In 2014, the Frank Davis “Naturally N’Awlins” Memorial Bridge was renamed the new I-10 Twin Span Bridge in honor of Frank Joseph Davis. Davis, a WWL-TV news anchor and on-air personality, went away in 2013. He like to fish close to the bridge.

Louisiana Bridges Dominating in the United States

At 5.4 miles, the Frank Davis “Naturally N’Awlins” Memorial Bridge may seem modest in comparison to the almost 24-mile Lake Pontchartrain Causeway. But don’t be fooled by the distance difference! “Naturally N’Awlins” may be number six on this list, but it is voted 12th overall in the US! Six of the fifteen longest bridges in the nation and four of the top five are located in Louisiana. You could argue that Louisiana is “covered” when it comes to bragging rights when it comes to bridges.

Is All the Bridge Talk Getting a Little Tolling? Go Past It!

Although Louisiana is a melting pot of cuisine, celebrations, and culture, we must not overlook its contribution to the nation’s transportation networks. Louisiana boasts six of the nation’s most remarkable bridges, spanning rivers, bayous, swamps, and lakes. Make sure Louisiana is on your travel itinerary if you’re a passionate bridge fan!

Overview of the Six Longest Bridges in Louisiana

Rank in LA Rank in the USA Bridge Name Distance
1 1 Lake Pontchartrain Causeway 23.875 Miles
2 2 Manchac Swamp Bridge 22.8 Miles
3 3 Atchafalaya Basin Bridge 18.2 Miles
4 5 I-10 Bonnet Carré Spillway Bridge 11 Miles
5 6 Louisiana Highway 1 Bridge 8.257 Miles
6 12 Frank Davis “Naturally N’Awlins” Memorial Bridge 5.4 Miles