Government or official record
The Great Mississippi River Flood of 1927
National Weather Service New Orleans/Baton Rouge
Where this source supports the record
Each entry separates the article’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.
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Natural disasters · 15 April–August 1927Open article references →
The Great Mississippi Flood of 1927
Mounds Landing levee breach and lower Mississippi floodplain · United States
Why editors use it hereMeteorological and hydrologic history of rainfall, crevasses, inundation, casualties, and policy.
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Quick read
After months of exceptional rain, the lower Mississippi River overwhelmed levees in spring 1927 and flooded about 27,000 square miles.
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Trigger and conditions
Successive tributary floods moved downstream as levees failed at scores of locations.
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Uncertainty
Death estimates range from roughly 250 to more than 500 because rural and Black deaths were poorly recorded.
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Why it matters
The flood was both hydrologic and political.
Reviewed 26 July 2026
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Quick read