Manchac Swamp Bridge

The Manchac Swamp Bridge (Other name: I-55 Manchac Swamp Crossing) is located on Manchac Swamp between Lake Maurepas and Lake Pontchartrain, close to Lake Pontchartrain. in Louisiana, USA, it is a twin concrete trestle bridge.

Manchac Swamp Bridge
Manchac Swamp Bridge

The bridge has two parts, the northern one which connects the towns of Starder and North Pass and the southern sections which connects the towns of Manchac and Galva.
It is a concrete bridge that includes two bridges that actually carry National Highway 51 and Interstate 55. And it accounts for about one-third of the 66 highways in Louisiana. It has an important position in the region.

Satellite image of Manchac Swamp Bridged
Satellite image of Manchac Swamp Bridged

The bridge was built in the late 1970s and Opening in 1979.

Bridge parameters

Side of Manchac Swamp Bridge
Side of Manchac Swamp Bridge

With a total length of 22.80 miles (36.69 kilometers), it is one of the longest water bridge in the world and one of the longest bridges on the interstate highway system.
The total width of the 2 bridges plus Gap between bridges is estimated to be close to 95 meters (312 ft).

Manchac Swamp Bridge crosses above the swamp
Manchac Swamp Bridge crosses above the swamp

its piles were driven 250 feet (76 m) beneath the swamp and with the cost of the span being $7 million per mile to complete.About US $160 million total in 1975.

Local legend

The bridge spans a swamp that is supposedly haunted with a Rougarou (Cajun werewolf, also known as loup-garou) and a voodoo princess.
Legend has it that the princess placed a curse on the surrounding areas and indeed a hurricane swept away three towns on the day of her funeral in 1915.

Manchac Swamp Bridge is one of the most beautiful bridges on earth
Manchac Swamp Bridge is one of the most beautiful bridges on earth


Though a previous Manchac bridge suffered a fatal collapse in 1976, the present structure has resisted the historic hex and remained stable.
It’s quite safe to drive over the bridge despite any legends, but swamp swimmers below should be aware of the fully real alligators that float on the tranquil waters below the pier.

Traffic sign for Manchac Swamp Bridge
Traffic sign for Manchac Swamp Bridge

Manchac Swamp Bridge Causeway Data

Country
America
Location
St. John the Baptist Parish / Tangipahoa Parish, Louisiana, USA
Official name
Manchac Swamp Bridge
Other name
I-55 Manchac Swamp Crossing
Cost
US $160 million
Status
In use
Maintained by
Louisiana Department of Transportation and Development
Began
Late 1970s
Opened
1979
Length
22.8 miles (36.7 km)
Length over water
22.8 miles (36.7 km)
Width
95 m/312 ft(2 bridges + Gap between bridges)
Bridge type
Lake(Swamp) bridge
Crosses
Manchac Swamp
Road scale
4 lanes

Manchac Swamp Bridge Location On Earth

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REVIEW OVERVIEW
Scale ( only within the industry of this building / engineering )
8.3
Technology ( only within the industry of this building / engineering )
7
Cost ( only within the industry of this building / engineering )
4.8
Era-1970s ( The earlier the era, the higher the score,respect the older generation of engineering )
7.9

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