The Mobile Causeway, built in the late 1920s, restricts the natural hydrologic connection between the Mobile-Tensaw Delta and Mobile Bay. The causeway has profoundly altered the hydrology, water quality, salinity, and ecological function of the system—harming finfish, shellfish and other wildlife in the bay and in the delta. The project proposes to elevate the causeway at Justin’s Bay, restoring tidal exchange in the Mobile-Tensaw Delta by re-connecting it to Mobile Bay.