Slaughterhouse Island was trashed over the weekend and some of the students were from the University of Oregon.
Mike Reha, Silverthorn Resort general manger, said those same students trashed his houseboats.
"The manner in which the boats were treated is just completely disrespectful and disgraceful," he said.
He had 38 houseboats out on the lake, and when they were returned, the majority of them were trashed and mud was everywhere.
"The scene is just horrific when these boats come back," Reha stated.
He said when college students come, it is expected that there will be some damage, but not this much.
"It's not normal, it's abnormal," he said. "The students last weekend were especially destructive."
Most of the boats needed to be professionally cleaned, especially the upholstery.
"We do have measures in place to try and prevent damages to the boat in the form of high deposits," he noted.
However, the deposits did not stop these students.
He explained between the 38 boats the clean up cost was over $60,000 to get them ready on time for this coming weekend.
Reha added normally, when college students come to town, the clean up cost is around $40,000.
The students did pay for all the extra costs, according to Reha.
He hopes the next batch of students will not slaughter Slaughterhouse Island and his boats.
"We are this weekend going to hand out more literature and educate the students a little bit more, as well as provide additional trash bags," he explained.
Reha had a message for the UC Davis students.
"We welcome the students of UC Davis for Memorial weekend and hope they can clean up the island and keep the boats in a decent condition," he stated.
From time to time Reha noted they will ban people from renting their boats. He said this week his list got a little bit longer because the damaged left behind by some of the students.
Reha mentioned it's good for the economy when the students come to town because the increase in business, but hopes they will learn to be more respectful.