The USGS liaisons are updating the United States Interagency Elevation Inventory (https://coast.noaa.gov/
The project is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, U.S. Department of Agriculture, and U.S. Army Corps of Engineers.
This web service provides users with access to data including: topo LiDAR, shoreline data, bathymetric LiDAR, hydrographic surveys and much more – see the resource HERE