what we do

Biological Sciences & ESA

Delivering pragmatic, science-based strategies to benefit our environment

Our team of biologists, ecologists, and environmental planners blend practical experience with scientific understanding to develop solutions that work. Our approach includes developing a range of strategies to manage risks, building on best practices, and streamlining the permitting and mitigation process. We help our clients comply with the Endangered Species Act (ESA) and achieve policy goals and directives, reduce regulatory compliance delays, reduce risk, improve stakeholder relationships, and improve the health and resiliency of our environment.

East Lake Sammamish Trail | Parametrix
​East Lake Sammamish Trail
​​​Issaquah to Redmond, Washington
Client: ​​​King County

The 11-mile East Lake Sammamish Trail crosses three jurisdictions, dozens of streams, and over 70 wetlands. In order to understand the effects of the project, develop appropriate mitigation measures, and comply with environmental regulations, Parametrix delineated wetlands, prepared critical areas studies, and developed a Biological Assessment. We also prepared a Biological Assessment to address impacts to Puget Sound Chinook salmon and bull trout and their designated critical habitat, Puget Sound steelhead, and bald eagles.



  • Inland Avian Predation | Parametrix

    Inland Avian Predation Management Plan

  • Hualapai Range Survey | Parametrix

    Hualapai Range Survey

  • East Lake Sammamish Trail | Parametrix

    East Lake Sammamish Trail

  • Columbia River Crossing | Parametrix

    I-5 Columbia River Crossing Fish Hydroacoustics Study

  • Rio Grande Bosque | Parametrix

    Rio Grande Bosque Rehabilitation

  • SR 520 Bridge | Parametrix

    SR 520 Bridge Replacement and HOV Program Biological Consulting


"Parametrix has field staff that is very knowledgeable in plant identification, soils, and ecology. They are excellent to work with and very willing to share their knowledge and experience in data collection."

Robin Honani, Manager, Hualapai Agriculture Program