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Owners of two big boats at the Lake of the Ozarks face hefty fines after the Coast Guard caught them allegedly violating passenger vessel laws and regulations.

The Coast Guard, in a news release Saturday, said it terminated the voyages of two boats, The Shady Shack and The Play Pen.

The Shady Shack, a 50-foot yacht carrying 24 passengers, was boarded by a Coast Guard crew on Friday in the vicinity of Gravois Arm.

Separately, the Coast Guard said it observed from a dock The Play Pen, a 42-foot boat carrying 15 passengers.

The owners and operators of the boats, who were not identified, were charged with several violations, including not having a valid certificate of inspection, lacking a credentialed mariner in control, and failing to have a drug and alcohol program.

The owners and operators of The Shady Shack and Play Pen face civil penalties of up to $41,546 for conducting an illegal passenger-for-hire operation, the Coast Guard said.