USA LA: Manchac Swamp Bridge USA LA: Manchac Swamp Bridge USA LA: Manchac Swamp Bridge map, ecosystem, geography, geographical, USA, United States of America, LA, Louisiana, Manchac, Swamp, Bridge 2004-04-18 image/svg+xml USA LA: Manchac Swamp Bridge 2004-04-18 Integration and Application Network https://ian.umces.edu/media-library/usa-la-manchac-swamp-bridge/ https://ian.umces.edu/media-library/usa-la-manchac-swamp-bridge/ en-US map, ecosystem, geography, geographical, USA, United States of America, LA, Louisiana, Manchac, Swamp, Bridge USA LA: Manchac Swamp Bridge