The Atchafalaya Basin is the largest river swamp in North America — a million-acre wilderness of cypress, Spanish moss, alligators, and egrets 30 miles west of Baton Rouge. Swamp tour operators run out of Henderson and Breaux Bridge. The basin is what the Old River Control Structure is fighting to protect: if the Mississippi jumps its channel to the Atchafalaya, this entire ecosystem changes overnight.
Quick facts
- ·The Atchafalaya Basin is the largest river swamp in North America — roughly one million acres of cypress, Spanish moss, alligators, and wading birds.
- ·Located approximately 30 miles west of Baton Rouge, accessible via I-10 through Henderson and Breaux Bridge.
- ·The basin is what the Old River Control Structure is fighting to protect: if the Mississippi jumps to the Atchafalaya, this ecosystem changes overnight.
- ·Multiple tour operators run boat tours through the swamp year-round; spring and fall offer the best wildlife viewing.
- ·The Atchafalaya Basin Bridge carrying I-10 across the swamp is 18.2 miles long — one of the longest bridges over water in the United States.
- ·Tours depart from Henderson and Breaux Bridge. Book in advance during peak season (March–May).
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Editorial content compiled with AI assistance. Place details verified against public records.