Minnesota Department of Transportation

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Environmental Assessment

Environmental documentation


Transportation projects vary in type, size and complexity, and potential to affect the environment. The Environmental Assessment Unit provides technical assistance and guidance on the preparation and processing of environmental documents under the National Environmental Policy Act for projects receiving Federal Highway Administration funding and for projects triggering a mandatory category under the Minnesota Environmental Policy Act.


  • Selection of the appropriate level of documentation - Categorical Exclusion, Environmental Assessment, Environmental Impact Statement.┬áSee Highway Project Development Process (HPDP) Environmental Document Decision Tree and document forms.
  • National Environmental Policy Act (NEPA) - See FHWA Environmental Toolkit
  • Minnesota Environmental Policy Act (MEPA) - See Minnesota Environmental Quality Board (EQB) and Minnesota Rules ch. 4410
  • For additional NEPA-related topics such as Section 4(f), Section 6(f), Environmental Justice and other special topics, please see the HPDP or contact the Environmental Assessment Unit Chief.