Tag Archives: longest bridges in the world

Lake Pontchartrain Causeway

This entry is part 2 of 12 in the series Bridges

The Lake Pontchatrain Causeway

Lake Pontchartrain Causeway

also known as the Causeway is the worlds second longest bridge at 23.87 miles behind the Bang Na Expressway (33.51 mi) , the Causeway is the longest bridge in the world over water as of this posting. 

Lake Pontchartrain Causeway

The Lake Pontchatrain Causeway crosses over Lake Pontchartrain in southern Louisiana, USA.  The bridge connects Metairie, Louisiana, a suburb of New Orleans and Mandeville, Louisiana. 

Lake Pontchartrain Causeway air view

Although I don’t have the numbers on the amount of steel used in the building of this bridge I do know there are over 9000 concrete pillings supporting the bridge. 

Lake Pontchartrain Causeway overview

The The Lake Pontchatrain Causeway first opened in 1956 and was at that time a a two-lane span of 1/100th of a mile. bridges was expanded on and re opened on May 10th, 1969. This bridge is a toll bridge and always has been.

Lake Pontchartrain Causeway draw bridge section

More details on the Lake Pontchartrain Causeway, daily traffic is around 43,000 cars per day with a $5 USD toll southbound at the time of this update nov. 2019.  The bridge is supported by 9,500 concrete pilings.  In 2011 it was named the longest bridge over water by the Guinness World Records, after words it was divided in to 2 different categories continuous and aggregate.  It is considered the longest continuous bridge over water.  Jiaozhou Bay Bridge in China is the longest bridge over water aggregate.

After Hurricane Katrina Lake Pontchartrain Causeway lost 17 spans but structural foundations remained intact.  Lake Pontchartrain Causeway is 1 of 7 highway spans in Louisiana


Lake Pontchartrain Causeway 1
Lake Pontchartrain Causeway - 2 lane

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Bang Na Expressway

This entry is part 1 of 12 in the series Bridges

This is the first in our bridge series although a bridge is not the first thing you think of when you talk about Steel Buildings it is one of the first things you think about when you talk about Steel Structures, and although most bridges are not made mostly of steel, they almost all use a significant amount of steel, either as cables or more commonly steel used in reinforcing concrete ,with out the Steel most large structures today could not be possible, so lets start the Bridge Series with the Bang Na Expressway

Burapha Withi Expressway

 The Bang Na Expressway is a huge Conrete and Steel Bridge that streches 33.51 Miles to make it the longest Bridge in the world as of this posting.

Bangna Bangpakong Road

The Bang Na Expressway is also known as the Burapha Withi Expressway  this Bridge is located in Bankok , Thailand.

Bang Na Expressway

Althought we don’t have the exact amount of steel used on this job we do have some other info for you and pictures.

Structure Elements

Foundation of main line

Main Column

Portal Frame

D2/D3 and D6


  2. Dia800 mm (31.5")
  3. 120 mm wall thickness
  4. wo sections welded
  5. 16 piles per pier
  6. PILE CAP,
  7. 2.5 m(8.2") thickness
  8. Below the flow line


H – Shape, slender light appearance

Average height of 16 m (52.5’)


Burapha Withi Expressway portal frame


  1. Toll plazas, merging areas of the ramps
  2. Portal Frame with D2/D3 and D6 segments


  1. Two components connected by a turntable
  2. Launching girder with two main spans long
  3. Erection girder with two portal spans long

Bang Na Expressway h shaped dimensions

Bang Na Expressway under construction

Bang Na Expressway under construction

Bang Na Expressway under construction

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