Chances are, you’ve driven on a highway, street, or bridge that our transportation experts have designed. From planning through design and construction administration, our transportation services are designed with you in mind.

Modern life depends on the movement of goods and people. TD&H offers a staff of professionals with a passion for creating safe and efficient transportation designs. TD&H Engineering facilitates the design process by coordinating with our other in-house disciplines to adhere to federal, state and local design criteria. Whether the project calls for roadway, railway, or other transit design, the professionals at TD&H Engineering strive to improve the quality of life through forward-thinking and cost-saving innovation.

We also specialize in community improvement projects such as bicycle/pedestrian pathways all while being historic and environmentally sensitive to national parks and reservations. Since our incorporation in 1965, our track record proves we can integrate the diverse engineering disciplines required to implement each client’s vision.

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Services Include:

  • Bike Lanes & Paths
  • Bridges
  • Engineering for Highways, Roads, Streets and Subdivisions
  • Integration of Streets & Drainage Control
  • NEPA/MEPA Compliance Documents
  • Parking Lots
  • Pavement Design
  • Railroad Mainline/Sidings
  • Right-of-Way Mapping
  • Traffic Impact Studies
  • Transportation Planning

Recent Transportation Projects

  • McKenzie County Hospital

  • City of Leavenworth Commercial Street Improvements

  • City of Livingston Engineering Services

  • Five Mile Road Improvements

  • Foster Creek Avenue Improvements

  • Nelson Street Rehabilitation

  • Third Street Reconstruction

  • Downtown Spokane Transit Center & Sky Bridge

  • St. Joseph Regional Medical Center- Central Energy Plant

  • CSKT Renovation Projects

  • Lewiston 4th Street Parking Project

  • South of Ravalli to Medicine Tree

  • Special Improvement District

  • S. 19th-Babcock to Kagy

  • Agri-Processing Facilities