National Levee Database

About the NLD

The NLD currently includes information for more than 7,000 levee systems. Learn more about the history of the NLD and its mission.

Learn about the NLD

Levee Basics

How do levees work? What kind of levees are there? How have levees changed over time? Discover this and more in our Levee Basics section.

Learn about Levees

Flood Basics

A flood can happen anywhere there is water - learn how you, your family, and your community can prepare for flood events.

Learn about Flooding

How to Submit & Update Data

If you notice data that is out of date or incorrect, you are able to submit a data change request. Learn how here.

Data Change Request

The National Levee Database captures all known levees in the United States. It provides users with the ability to search for specific data about levees and serves as a national resource to support awareness and preparedness around flooding.

The database is intended to help decision makers understand levees - including their location and condition. This information can be used to identify critical levee issues, focus priorities for funding, understand the true cost of maintaining levees, support community preparedness, and quantify the nation's flood exposure.