Caernarvon Freshwater Diversion and Delta

Located 15 miles downriver from New Orleans in Plaquemines Parish near the Plaquemines/St. Bernard Parish line is the Caernarvon Freshwater Diversion.  Constructed in 1991, the diversion was designed to divert up to 8,000 cubic feet per second, approximately the volume of 2,353 large crawfish pots each second. It's intended purpose was to move fresh river water from the Mississippi into the local estuary, limiting the capture of sediment. Despite this, new land is building in the diversion's main catch basin, Big Mar Pond.