We are a collaborative group of civil engineers

We provide civil engineering services to private and public organizations on a diverse type of projects and sizes. 

OUR SERVICES

    • Temporary erosion and sedimentation control

    • Site demolition plans

    • Foundation and subsurface drainage plans and design

    • Paving and grading design

    • Drainage design

    • Low impact/green infrastructure design (LID/GSI)

    • Sanitary sewer, water systems, and utility design

    • Roadway design

    • Plan, specifications, and cost estimate preparation

    • Roadway

    • Drainage
         H&H
         Flow Control/Detention
         Stormwater Quality

    • Design
         Low Impact

    • Design/Green

    • Infrastructure
         Master Drainage

    • Plans/Planning

    • Water
               Water Main Transmission and Distribution
         Storage

    • Sanitary Sewer
         Sewer Main
         Pump Stations

    • Power/Low Voltage
         Distribution

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Project 1
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  • EQUITY

    Coterra Engineering PLLC is a Minority Owned Business Enterprise. We are registered with the City of Seattle WMBE Program.

  • EXPERIENCE

    We’ve been providing civil engineering solutions for more than two decades. We're seasoned experts on drainage and regulatory requirements, and we use our knowledge to design projects that are economical, efficient and compliant — with an emphasis on sustainable methods.