US Army Corps of Engineers
Louisville District Website


An alteration is any action by an entity other than the U.S. Army Corps of Engineers (USACE) that builds upon, alters, improves, moves, or occupies an existing USACE civil works projects.  There are two types of alterations, Section 408s and LNOs, which are described below.

As a general rule, any work within 50 feet from the project must have USACE review.   


USACE Review Timelines

Plan adequate time for a review:

  • Completeness Determination (30 days)
  • USACE Review and Decision (90 days)

Track your alterations HERE (use Chrome)

Contact Us

Louisville District, Section 408 Email:

Section 408 Request

The U.S. Army Corps of Engineers (USACE) Section 408 policy, EC 1165-2-220 effective September 10, 2018, sets forth the process and criteria USACE uses to review requests to alter USACE Civil Works projects which include dams, hydropower, levees systems, and navigational channels.  Communities may want to alter existing USACE projects to increase recreational opportunities or improve flood risk management.  Section 408 also applies if a business or utility company seeks to run power lines or pipelines over or through a USACE project.  The purpose of a Section 408 review is to ensure that the Congressionally-authorized benefits of a USACE project are not undermined by an alteration made by others, and to ensure the alteration is not injurious to the public interest.           

Requesters wanting to pursue Section 408 approval for an alteration must complete form (LRL-803) and submit to the Section 408 Coordinator and Levee Safety Area Representative (LSAR) via email at mail to:


Letter of No Objection (LNO) Request


Local Cooperation Agreements require a Non-Federal Sponsor to operate and maintain their levee/floodwall system in accordance with the project specific, mutually agreed upon Operation and Maintenance (O&M) Manual and 33 CFR 208.10.   


Non-Federal Sponsors performing rehabilitations (slip-lining, pump station renovations, slope repairs, closure restorations, etc.) are required to complete the LNO Request Form and submit to the Section 408 Coordinator and LSAR via email at