The US Army Corps of Engineers (USACE) Section 408 program allows another entity to alter a USACE Civil Works project. Given the widespread locations of these projects, many embedded within communities, over time there may be a need to either alter or occupy these projects and their associated lands.

Some examples of projects that need USACE Section 408 permission include running a water main from one side of a levee to the other, adding hydropower to a dam, building a bridge across a navigable waterway maintained and surveyed by USACE, or building a swimming pool in a backyard, within the footprint of the USACE easement for a levee. The Section 408 program verifies that changes to authorized USACE Civil Works projects will not be injurious to the public interest and will not impair the usefulness of the project.