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

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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

  • Congrats to Kyle Palagi, Structural Engineer

    Kyle Palagi, a professional engineer at TD&H Engineering in Great Falls, received his Structural Engineer license.
    “Kyle has been a great addition to our structural group,” said Wade DeBoo, regional manager. Structural Department Manager Rodney Blake, added, “We are proud that he is part of our organization and realize the SE license will allow him to excel in a way that yields many satisfied clients.”
    Palagi has been with TD&H for nearly two years in the structural department. He has focused his work on structural engineering and his experience includes commercial buildings, seismic retrofits, educational facilities, worship facilities and industrial structures. More >

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  • Employee Spotlight – Jenni Light

    Meet Jenni Light! She is an environmental engineer at TD&H’s Lewiston, Idaho office. Most often, her work includes coordinating environmental permitting with federal and state agencies. The Lewiston office has also started taking on more projects focused on environmental issues so these projects are beginning to include air emissions, Spill Prevention, Control & Countermeasure (SPCC) Plans, State Environmental Policy Act (SEPA), National Environmental Policy Act (NEPA) and Environmental Assessments. Jenni first learned about TD&H through Heather Calkins, another TD&H employee. Heather was in the first engineering class that Jenni taught and she now regularly comes back to that very same class since obtaining her degree and shares her school and engineering experiences. More >

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  • Employee Spotlight – Laurie Happ, Kalispell

    Chances are, if you have called TD&H office in Kalispell, MT, you have had the pleasure of speaking with Laurie Happ. She moved back “home” to Kalispell after living in Phoenix for 26 years and working for a large, nationwide general contractor. Hoping to find work again in the construction/building industry in Kalispell, she answered a newspaper ad and TD&H welcomed her as part of the team. She assists with general office tasks, whether it’s mailing out invoices, finalizing proposals, preparing bid tabs, or buying the much needed coffee for the office. What does Laurie like most about TD&H? Her coworkers; More >

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