Tri-Level Interchange – New I-70 Over I-55 and I-642018-07-31T19:59:17+00:00

Project Description

Tri-Level Interchange – New I-70 Over I-55 and I-64

As part of the new bridge project over the Mississippi River at St. Louis, Interstates 55, 64, & 70 will now be split so that I-70 is diverted along a new alignment to pass over the new bridge and I-55 / I-64 will continue over the existing Poplar Street Bridge. TWM’s structural engineering staff prepared the curved girder erection plans for two of the structures on this project.These were 3-span structures ranging from 457’ to 487’ long with 7’ tall steel plate girders.TWM also designed temporary soil retention systems at several of the substructures and checked cantilever forming brackets.

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  • LOCATION: East St. Louis 

  • OWNER: IDOT 

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