Saltwater wetlands that include marshes and shoals on Virginia's Atlantic coast. U.S. coastal wetlands losses were 25 percent greater from 2004-2009, according to a recent federal study. U.S. Fish and Wildlife Service hide caption itoggle caption U.S. Fish and Wildlife Service The Two-Way Rate Of Coastal Wetlands Loss Has Sped Up, U.S. Study Says November 22, 2013 The U.S. lost an average of 80,000 acres of coastal wetlands from 2004 to 2009, according to recent government data. In a recent period, more than 70 percent of the estimated loss came in the Gulf of Mexico.