Capital Interchange – Cedar Interchange

The Capitol Interchange-Cedar Interchange project involved reconstructing Interstate 15 between the Capital Interchange and the Cedar Interchange on I-15 in Helena, MT. The focal point was replacing a pair two lane bridges that span the Montana Rail Link rail yard with 3 lane bridges. The new bridges are approximately 800 feet long and span 14 railroad tracks. Maintaining traffic during construction was critical due to traffic volumes and weaving movements associated with the closely spaced interchanges. The HDR design allowed construction during the short Montana construction seasons while minimizing impacts to the rail yard.

HDR was awarded the 2018 American Council of Engineering Companies of Montana Honor Award for this project.  UMS provided Phase I SUE services for this project to HDR for design services.

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