Funding for this research was provided by the U.S. Geological Survey Coastal and Marine Geology Program and the Louisiana Department of Natural Resources (LDNR) as part of the Barrier Island Comprehensive Monitoring (BICM) Program of Louisiana Coastal Area Ecosystem Restoration (LCA). Assistance in the field and lab was provided by the University of New Orleans, William Danforth, Charles Worley, and Emile Bergeron of the USGS, Joseph Malbrough of the Louisiana Universities Marine Consortium (LUMCON), and the captains and crew of the R/V Acadiana. This manuscript benefited from reviews by Seth Ackerman, Brian Andrews, and VeeAnn Cross.