2025 Map of Main Pass

About this map

Main Pass bisects this water-dominated landscape in Plaquemines Parish, where the Mississippi River delta meets the Gulf of America. The map reveals an intricate network of navigable channels and marshy basins, including Octave Pass North, Cottam Pass, and Delta Pass. This environment is punctuated by small landmasses such as Timber Island, Contrariete Island, and Japan Island, which stand as landmarks amidst a maze of ponds and bayous. Numerous family-named or descriptive water bodies like Henderson Pond, Blue Goose Pond, and Snow Goose Bayou reflect the local geography of the lower delta. The drainage patterns here, from Grants Pass to Wiltz Pass, illustrate the ever-shifting hydrology of the Louisiana coastline, providing a detailed record of these fragile wetlands as they appeared in the early 21st century.