Inland U.S. Cities with Navigable Waterways to the Sea
Cities in the U.S. without coastal beaches that can be accessed via boat from the ocean, sometimes with the help of locks. Core cities of metro areas of at least 750,000 people. Note the stars to denote grey areas in qualifications.
*Some may be debatable as to whether they are "inland" or coastal.
**Not sure about this one, maybe not with larger boats because of bridges.