The subjects you see in this video removed two life rings from the docks and threw then in the water before they floated away.
Port Auditor Jennifer Bly said these life rings will cost $240 to replace.
"We have a lot of people that go down there and fish, or tie up their boats to use the restroom, or get something to eat," said Bly. "If someone slips and falls in the water you can throw them the life ring, but now we can't. So, its very important that they're there and they stay there."
If you recognize the people in this video, or you have additional information about this incident you're asked to call the Clarkston Police Department at (509) 758-1680.