Maine's I-95 Twin Bridges, Town of Etna

  • Designed in three short months

  • Replacement bridges 78-foot long; 40-foot wide composite steel plate girder superstructures

  • Design required use of shallow, Grade 50 steel plate girders

As Prime Consultant, Erdman Anthony provided project oversight and management, as well as preliminary and final design and construction support services. Because a portion of the federal funding for the project was in jeopardy, the client required the project to be designed in three (3) short months as a condition of the contract award. Erdman Anthony was able to deliver the project on time.

The replacement bridges are 78-foot long; 40-foot wide composite steel plate girder superstructures supported on T-wall wrapped integral abutments on piles. The need to improve deficient bridge under-clearances and minimize impact to I-95 required the superstructure to be designed with shallow, Grade 50 steel plate girders. Work on the project included: completion of a comprehensive design report which detailed lifecycle cost analysis of six different alternatives required by FHWA to justify our design recommendation, preparation of all preliminary & final design plans, a public meeting presentation, coordination of the project team, shop drawing and value engineering proposal reviews and construction administration services.

During construction, traffic was maintained by utilizing staged construction. Indus Engineering, Inc. a certified minority business enterprise provided estimating services.


Project Accolades

  • Project Articles

Project Details


Etna, ME


Maine Department of Transportation

Project Contact

Frank Dahar, PE
  • Frank Dahar, PE
  • 585-427-8888 x 1082
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