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.

Hualapai Range Survey | Parametrix
​Hualapai Range Survey
​​​Northern Arizona
Client: ​​Hualapai Tribe

The Hualapai Tribe has vast rangeland resources in remote areas of northern Arizona, part of which is home to a lucrative big game hunting operation. Parametrix assisted the Tribe in developing sustainable livestock stocking rates on more than 500,000 acres. This involved a comprehensive rangeland assessment on three districts and wildlife rangeland assessments in areas that are not grazed but provide important forage for elk, deer, and pronghorn. We prepared a reader-friendly report to document sustainable stocking rates and rangeland conditions. The report included an atlas with statistical data summaries for each range allotment.



  • 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