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National Environmental Policy Act (NEPA)
Environmental Process

There are more than 40 federal and state environmental laws that affect transportation decisions. A unifying federal environmental law is the National Environmental Policy Act of 1969 (NEPA), which provides a framework for addressing the various environmental statutes, regulation and policies. NEPA is a procedural statute (40 CFR sec 1500) for decision-making during federal projects to assure analysis of social, economic and ecological impacts. ITD is required to provide a NEPA document for projects that are federally funded through the Federal Highway Administration (FHWA).

NEPA Requirements

  • Study a reasonable range of alternatives based on “Purpose and Need”
  • Use a systematic, interdisciplinary approach while evaluating environmental factors during the planning process
  • Widespread interagency coordination, review, and consultation
  • Documentation of the environmental analysis process in plain language
  • Provide the public opportunity to participate and comment throughout the process

NEPA Training

Three Types of NEPA Documents

Environmental Evaluation (EE) – is an ITD document approved by the Idaho Division of FHWA for Categorical Exclusion (Cat. X) decision-making or auditing purposes.

  • Examination of project concept and location regarding potential for socioeconomic or ecological impacts
  • Determination of impact significance

Environmental Assessment (EA)

  • Unsure if significant impacts
  • Evaluation of key resources
  • Finding Of No Significant Impact (FONSI)

Environmental Impact Statement (EIS)

  • Significant Impacts
  • More detailed evaluation
  • Record Of Decision (ROD)

ITD Environmental Process Flow Chart
Environmental Process Manual
ITD-654 Form
Citizen’s Guide to the National Environmental Policy Act (NEPA)


Page Last Modified: 11/15/2012 9:07:04 AM

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Idaho Transportation Department
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