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We tackle your pipeline design needs efficiently, obtain all necessary permits, implement technology to reduce costs, shorten schedules, and to provide just the product and service you need.


Let us help you define boundaries, control construction, and measure stabilization. Our team has been there before and we'll make sure you start off on solid footing.


There’s really only one way to get the job done right – provide you with exactly the personnel and expertise you need, no more and no less. We can supplement your staff to match the ebb and flow of construction activity so that you’re always operating at peak efficiency.


With a combination of pre-construction environmental permitting and construction inspection expertise, our staff is uniquely positioned to provide the most highly constructible projects while minimizing environmental impacts. Your project will be permitted and constructed right from the start.


Simplify your project delivery team and eliminate finger-pointing by leveraging our contracting subsidiary, MacKay Sposito Constructors, to combine our design services with construction.  By combining our design with construction services you’ll receive schedule and budget information much earlier, as well as accelerated delivery of the project.



Transmission & Distribution

Our diverse team understands the challenges of defining rights-of-way, designing pipelines, and constructing projects in both urban corridors and in remote locations. Let us help you complete your projects on-time and within budget.

A SNAPSHOT OF our work

Kennewick WA

Southridge High Pressure Gas Main

Cascade Natural Gas

Project Highlights:

  • New 2.5-mile, 6-inch diameter gas main
  • Will serve thousands of acres of developable land
  • Included siting for a pressure station
  • Designed in coordination with construction of a new arterial street

Vancouver WA

119th Street Gas System Reinforcement

Northwest Natural

Project Highlights:

  • 5-mile, 8-inch gas main to reinforce existing system
  • Performed staking of rights-of-way, easements, and boring locations
  • Performed as-built survey ties and prepared as-built maps

Grants Pass, OR; Roseburg, OR; Lewiston, ID

Cow Creek, Umpqua, and Clearwater Profiles


Project Highlights:

  • Located three existing gas pipeline crossings
  • Determined depth as well as horizontal location
  • Mapped the creek and river bottoms using a single beam echo sounder
  • Prepared plan and profile maps of each crossing

Whatcom County WA

Dakota Creek Bridge HD Replacement

Cascade Natural Gas

Project Highlights:

  • New 6-inch steel gas main in coordination with a bridge replacement
  • Tight timeline due to bridge construction window
  • Provided surveying, civil design, and permit drawings
  • Prepared legal descriptions for a new DNR lease