Commemorating the 100-year anniversary of the greatest flood in American history

The Great Flood:

A Mississippi River Centennial 1927-2027

As the 100 year anniversary of the greatest flood in American History approaches, join the Louisiana Trust and our partners in highlighting and commemorating its impact on communities across the country.

The Largest Flood in American History

The Flood of 1927 was caused by heavy rainfall throughout the United States from August 1926 to the spring of 1927, inundating more than twenty thousand square miles throughout the Mississippi River Valley. By springtime, floodwaters destroyed more than 120 levees and created 42 crevasses along the Mississippi River and its tributaries, causing flooding from Cairo, Illinois to the Gulf of Mexico.

Flooding was widespread and impacted several states, including Mississippi, Louisiana, Arkansas, Kentucky, Tennessee, Missouri, and Illinois. Hundreds of thousands of people were displaced and hundreds of people perished—the exact number is unknown. The flood was one of the worst disasters in American history. The following year, Congress passed the Flood Control Act of 1928, which authorized the U.S. Army Corps of Engineers to create the Mississippi Rivers and Tributaries Project to better protect communities and valuable farmland from future flooding on the Mississippi River system.

As we approach the centennial of this major event in our country’s history, the Louisiana Trust for Historic Preservation (LTHP) is working with a network of partners to examine how this flood changed our cultural landscape and continues to do so to this day. The Great Flood Project will share stories of the disaster’s impact and encourage the public to visit the region for a better understanding of the places and communities that were affected.

Quick Facts

April 1927

Flood began

23,000+

Sq miles flooded

700,000+

displaced

246*

perished

$7.4 billion*

property damaged

*confirmed dead – hundreds more. *converted to 2025 dollars | Source: National Weather Service

How will the Great Flood be Commemorated?

The Great Flood: A Mississippi River Centennial 1927-2027 is a two-year project that commemorates the devastating 1927 flood and its lasting impact on the communities throughout the Lower Mississippi Valley. This collaborative initiative invites arts and culture organizations, artists, businesses, and local communities to participate by hosting events and programming throughout the impacted area. A key component of the project is the installation of site-specific markers to recognize the people, places and events affected by the event and its aftermath. Markers will be funded through community-driven efforts and facilitated by the Louisiana Trust for Historic Preservation .

Join us in exploring this powerful moment in our nation’s history and contributing to the shared legacy of resilience and recovery.