Environmental Review Toolkit

Section 4(f) Tutorial

Section 4(f) Overview

This section will start you off with a general overview of the statute known as Section 4(f). More detailed information about each topic presented here is available as you navigate through this site.

collapse list What is a use?

Use of a Section 4(f) property occurs: (1) when land is permanently incorporated into a transportation project; (2) when there is a temporary occupancy of land that is adverse in terms of the statute's preservation purpose; or (3) when there is a constructive use (a project's proximity impacts are so severe that the protected activities, features, or attributes of a property are substantially impaired) Substantial impairment occurs only when the protected activities, features or attributes of the resource are substantially diminished..