488310  Port and Harbor Operations 

This U.S. industry comprises establishments primarily engaged in 
operating ports, harbors (including docking and pier facilities), 
or canals.

The data published with NAICS code 488310 are comprised of these 
parts of the following SIC industries:

    4491 (pt)  Operation of a port or waterfront terminal
    4499 (pt)  Seaway and lighthouse operations