We're a consulting engineering firm offering a full range of services throughout Montana, Washington, Idaho, North Dakota, Pennsylvania & Utah.

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Services Designed with You in Mind

  • TD&H Engineering Survey Services


    Licensed surveyors using the latest technology for commercial and residential survey projects

    Learn More about Surveying Services
  • TD&H Engineering Civil Engineering Services

    Civil Engineering

    Creative solutions for structural, transportation, geotechnical & construction management

  • TD&H Engineering Land Development Services

    Land Development

    Site development planning requires an interdisciplinary team approach. We can help!

  • TD&H Engineering Water System Services

    Water Systems

    We design water distribution, storage and treatment solutions for communities and individuals

  • TD&H Engineering Wastewater Services


    Wastewater collection and treatment solutions that are human & environment-friendly

  • TD&H Engineering Structural Development Engineering Services


    Fast, accurate, cost-effective solutions for everything from bridges to buildings

  • TD&H Engineering Geotechnical Services


    You’ll find the leading experts in the geotechnical engineering field right here

  • TD&H Engineering Transportation Services


    Creating safe and efficient transportation designs for roads and bridges since 1965

  • TD&H Engineering Survey Services


    From meandering bike & pedestrian paths to skate parks & wave riders, talk to our experts

  • TD&H Engineering Industrial Engineering Services


    We have been providing quality services to industrial clients since 1965

  • TD&H Engineering Survey Services

    Construction Management

    We ensure a smooth process from pre-bid conferences to inspection and quality control

TD&H Engineering Recent Blog Posts

  • Paving Begins on Columbia Falls to West Glacier Bike Path

    A bike path that ties Columbia Falls to Glacier National Park begins paving Sept 6, 2016. Our Kalispell office provided civil engineering, construction management and construction inspection services on this project. Read more

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  • Leavenworth Street Reconstruction “Best City Project”

    The City of Leavenworth Commercial Street reconstruction project received an Award of Excellence as “Best City Project” by Washington State Department of Transportation. The ribbon was cut on March 17, 2016. Commercial Street was a 2-lane asphalt roadway with no …

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  • River’s Edge Trail Expansion Complete Along 10th Ave S

    The expansion section of the River’s Edge Trail along 10th Avenue South is now open. Safety was the inspiration for the addition; the expansion will allow bikers and pedestrians to go from downtown Great Falls to the Marketplace area. The project …

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Active Projects