Theodore Roosevelt Expressway
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The Montana Department of Transportation (MDT) prepares an environmental study as required by the Montana Environmental Policy Act (MEPA) or the National Environmental Policy Act (NEPA) for actions taken by the MDT unless exempted by law. An action may include projects, permits, and studies where MDT expends funds or takes an action affecting the human environment. These environmental studies determine the affects of the action on the social, economic or natural environment and may result in the preparation of an Environmental Assessment or Environmental Impact Statement. Active and completed documents are listed below.

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