The average freshwater input to Lake Maurepas from these rivers and other minor terrestrial sources is less than 3,400 cubic feet per second (96 m3/s) (CWPPRA Environmental Workgroup, 2001).

The Manchac Swamp Bridge, which carries Interstate 55, traverses the narrow strip of land between lakes Maurepas and Pontchartrain.

That results in interesting patterns of tidal exchange and, presumably, in situ mixing on weekly and fortnightly time scales.

Initially, the Richard King Mellon Foundation donated 61,633 acres (249.42 km2) to the Louisiana Department of Wildlife and Fisheries (LDWF) for the Maurepas Swamp WMA.

"[3] Lake Maurepas is a site for a proposed carbon sequestration project by Occidental Petroleum and Air Products.