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

Landscape Architecture
Water & Wastewater
Funding Procurement
New Office Locations

Services Designed with You in Mind

  • Civil Engineering

    Civil Engineering

    Creative solutions for structural, transportation, geotechnical & construction management Learn More about Civil Engineering
  • Structural


    Fast, accurate, cost-effective solutions for everything from bridges to buildings Learn More about Structural
  • Geotechnical


    You'll find the leading experts in the geotechnical engineering field right here Learn More about Geotechnical
  • Transportation


    Creating safe and efficient transportation designs for roads and bridges since 1965 Learn More about Transportation
  • Recreation


    From meandering bike & pedestrian paths to skate parks & wave riders, talk to our experts Learn More about Recreation
  • Surveying


    Licensed surveyors using the latest technology for commercial and residential survey projects Learn More about Surveying
  • Industrial


    We have been providing quality services to industrial clients since 1965 Learn More about Industrial
  • Construction Administration

    Construction Administration

    We ensure a smooth process from pre-bid conferences to inspection and quality control Learn More about Construction Administration
  • Water System Engineering

    Water System Engineering

    Wastewater collection and treatment solutions that are human & environment-friendly Learn More about Water System Engineering
  • Wastewater Systems

    Wastewater Systems

    We design water distribution, storage and treatment solutions for communities and individuals Learn More about Wastewater Systems

TD&H Engineering Recent Blog Posts

  • TD&H Engineering – Spokane, WA: Covid-19 Update

    The Governor of the State of Washington issued a “Stay Home” order for all residents for two weeks.
    Although our physical location will be closed, WE ARE STILL OPEN FOR BUSINESS. The Spokane Office has been planning for this event for weeks and we are quickly transitioning our staff to their homes to continue serving our clients. We are very fortunate that we can do our jobs from almost anywhere.
    If you need to call us, you can still call our main number (509-622-2888) and Laurine will answer the phone just like always (with our state-of-the-art phone system, Laurine can do this from her home). More >

    Read More

  • TD&H Accepts ACEC Award for River Crossings Project

    TD&H is proud and honored to accept the ACEC Water Resources Honor Award for our work on the Missouri and Sun River Water Main Crossings project.
    The $5.5 million horizontal directional drilling project piqued public curiosity for the past year, and we are eager to share the details of this project where we partnered with AE2S and Brierley Associates. TD&H was the professional consultant responsible for the planning and design of this considerably complex project. We developed construction plans and specifications for new water main crossings under the Missouri and Sun Rivers.

    Great Falls relies on 4 river crossings to maintain pressure and flow in the distribution system west and north of the Missouri River. More >

    Read More

  • CMT (Construction Materials Technician)

    Job Description
    Thomas Dean & Hoskins, Inc. (TD&H) is an award winning consulting engineering firm offering a full range of services throughout Montana, Washington, Idaho, North Dakota and Pennsylvania. We serve a diverse clientele ranging from individuals and rural water districts to large corporations in populous cities. We assist our clients through all phases of their projects, starting with concept development through construction completion. TD&H has been satisfying clients since its incorporation in 1965 and has built an impressive resume of successful projects.
    TD&H strives to provide innovative engineering solutions to challenging technical problems by assigning professionals who understand the issues and deliver results. More >

    Read More

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