[Tagging] U.S. inland waterways

[Nathan Edgars II]

Is anyone familiar with the regulations governing the U.S. inland 
waterways (such as the Mississippi River and the Intracoastal Waterway)? 
From my brief look, it seems to be less "these barge configurations are 
allowed" and more "you can go anywhere but don't crash". Is this 
correct, or are there defined maximum sizes? In either case, any idea 
what the suitable tags might look like (other than the generic boat=yes 
ship=yes)?

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