A marina on a bayou about 0.2 mile W of Bayou Petit Caillou, at Cocodrie, has open and covered berths, gasoline, diesel fuel, a paved launching ramp, a 6½-ton fixed lift for handling boats up to 30 feet, ice, water, and marine supplies. The marina is accessible with Bayou Petit Caillou through a channel with a reported controlling depth of 10 feet in 1982.
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Bayou Petit Caillou is 29 miles long to its junction with Bayou Terrebonne 4 miles E of Houma. Several canals enter the bayou: Bush Canal leading to Bayou Terrebonne, and Boudreaux Canal and Robinson Canal connecting with Bayou Grand Caillou. Two miles above Cocodrie is a connecting route to Bayou Terrebonne through Sevin Canal, Bay Negresse, and Lake la Graisse, good for 3 feet on a favorable tide. About 5 miles above the entrance the bayou crosses the Houma Navigation Canal. In 1996, the controlling depth in Bayou Petit Caillou was 5½ feet from its junction with Houma Navigational Canal to Boudreaux Canal; thence in 1986, 1 foot to Bayou Terrebonne.
The lower portion of Bayou Petit Caillou is used considerably by local oystermen and fishermen. The bayou has considerable commerce in petroleum products, and oil well pipe casing, machinery, and supplies.
A highway extends S along the W shore to Cocodrie, 6 miles above the mouth of the bayou.