what we do

NEPA Documentation

Streamlining environmental solutions

Parametrix is recognized as a go-to firm in the West when it comes to developing and delivering high quality environmental documentation on the most complex and controversial transportation projects.  We understand NEPA and state environmental laws and assist agencies in navigating the process. We have developed hundreds of environmental documents for FHWA and state DOTs. Our documents ensure accountability, improve decision-making, engage the public, and protect critical elements of the natural and built environment. Our staff routinely trains environmental professionals nationally on improving the quality of NEPA documents and streamlined environmental program approaches.

Portland-Milwaukie LR | Parametrix
​Portland-Milwaukie Light Rail Project EIS 
​Portland to Milwaukie, Oregon
Client: ​​​Metro & TriMet
Partner: David Evans & Associates

The Portland-Milwaukie Light Rail project will extend Portland’s MAX light rail system from downtown and the South Waterfront District, across the Willamette River to Southeast Portland and Milwaukie. This 7.3 mile light-rail extension features a transit/pedestrian/bike-only bridge across the Willamette River, a critical habitat for salmon species protected under the ESA. The alignment also passes through areas with brownfields, degraded shorelines, and contaminated sediments. A detailed cumulative effects review of related projects such as trails, street, and streetcar connections to the light rail project was completed, supporting their expedited NEPA clearances. Parametrix prepared the EIS, which was completed in less than 3 years—Draft EIS in 2008, a Biological Assessment in 2009, and a Biological Opinion, Final EIS, and Record of Decision in 2010.

  • Outstanding Achievement Award for Excellence in Environmental Document Preparation, EIS Category, FTA


  • Alaskan Way Viaduct | Parametrix

    Alaskan Way Viaduct Replacement Program

  • Parametrix NEPA Documentation - I-5 Columbia River Crossing, Vancouver Washington to Portland, Oregon

    I-5 Columbia River Crossing

  • Lynnwood Link Extension | Parametrix

    Lynnwood Link Extension

  • NMDOT On-Call Environmental | Parametrix

    NMDOT On-Call Environmental Services

  • Portland-Milwaukie LR | Parametrix

    Portland-Milwaukie Light Rail Project EIS

  • SR 520 Bridge Replacement and HOV Program