Pass A L'Outre Light, Maritime navigation tower in Plaquemines Parish, United States

Pass A L'Outre Light is a cast-iron lighthouse sunk into the mud of the Birdfoot Delta near the mouth of the Mississippi River. Its lantern fell into the water by 2007, leaving a rusty, decapitated tower that stood about 40 feet (12 m) tall in 2017, down from 85 feet (26 m) when moved here in 1855.

The iron tower was cast in 1852 for the Head of Passes Light, then America's tallest cast-iron lighthouse, and was moved in 1855 to the mouth of Pass A L'Outre with a third-order Fresnel lens; John Lory, formerly keeper at Frank's Island Light, became its first keeper. Confederate forces removed the lamp and burned the stored oil at the start of the Civil War, and in 1862 burned the keeper's dwelling; Union forces took the lens and regained control in 1863, rebuilding the dwelling and restoring the light, painting the tower with coal tar. It was deactivated and abandoned in 1930 as the channel silted up.

The structure shows how important river navigation was for Louisiana's development, and the ruins stand today as a reminder of that era in the Delta.

The tower stands in open water and mud at the mouth of Pass A L'Outre, reachable only by boat; the structure itself is closed and cannot be entered. The site lies within the Delta National Wildlife Refuge, managed by the U.S. Fish and Wildlife Service, which owns the lighthouse. Boaters should expect shallow, shifting delta channels and plan around the risk of storms.

The tower was built at Head of Passes in 1852 as America's tallest cast iron lighthouse, then moved here in 1855 rather than replaced with a new tower. It stood 77 feet above mean low water in 1868; silting brought it to 59 feet by 1920, and by 2017 it rose only about 40 feet. In 1919 it was repainted in a black and white spiral daymark like Cape Hatteras Light.