Probably can't hit him with storage fees
for the past (as was never told / they never existed!).
Am surprised that no by-laws that prohibit folks simply doing WTF they want on public land - how about viewing it as an unauthorised structure? Much the same as if someone had simply plonked a Trailor on the land......could also deem the boat as an "unsafe" structure (maybe have a word with any insurance
company?) and use that as a reason to put owner on notice that it must be removed within 30 days, or will be done on his behalf - and placed somewhere else, on which Storage charges of XXX would be levied (same as a local boatyard would charge, plus a bit) , payable monthly - non-payment = boat will be seized and disposed of to cover costs (public auction
?), and the Owner pursued for any balance still due....
.....the trick being to sound reasonable should events
end up in court.