Bayou Petit Caillou, meaning little pebble in French, is a remnant distributary of the Mississippi River's ancient Lafourche Delta system in southeastern Louisiana. This slow-moving waterway flows south through Terrebonne Parish, paralleling Louisiana Highway 56 as it meanders through brackish marshes before emptying into the Gulf of Mexico near Cocodrie. The bayou offers paddlers a unique journey through Louisiana's rapidly changing coastal ecosystem.

The main paddling route extends approximately 17 miles from Chauvin to Cocodrie, with several access points along Highway 56 allowing for shorter trips. The waterway is entirely flatwater, making it suitable for beginners, though wind and tides can create challenging conditions near the coast.

Spring and fall provide the most comfortable paddling weather, while summer offers opportunities to observe nesting shorebirds. Winters can be chilly but often provide clearer waters and better fishing. Paddlers should be aware of alligators, though attacks are extremely rare.

Notable landmarks include the Chauvin Sculpture Garden, showcasing folk artist Kenny Hill's haunting concrete statues, and the Louisiana Universities Marine Consortium (LUMCON) facility near Cocodrie. The Marguerite Moffett Audubon Sanctuary protects 108 acres of brackish marsh and shallow open water along the bayou's banks, offering excellent birding opportunities.

Key boat launches include those in Chauvin, 8 miles north of Cocodrie, and 2 miles north of Cocodrie. The small fishing community of Cocodrie serves as the terminus, with amenities including lodging and a marina.

Historically, Bayou Petit Caillou played a vital role in the region's oyster and shrimping industries. Today, it serves as a stark reminder of Louisiana's land loss crisis, with subsidence and sea-level rise visibly reshaping the landscape.

Paddlers should be mindful of boat traffic, especially near Cocodrie, and check weather forecasts for wind and tide conditions. Multi-day trips are possible by camping on elevated platforms in the marsh, though permits may be required. As paddlers travel south, they witness the gradual transition from freshwater swamps to brackish marshes and finally open water, providing a poignant journey through Louisiana's disappearing wetlands.