A 48-foot private boat sank over the weekend in about 15 feet of water at a Port of Kennewick dock on Clover Island.
No injuries were reported.
Port officials placed an oil-spill containment boom, which looks like buoys, around the boat to make sure no oil or gas spreads into the marina.
So far no leaks have appeared, they said.
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Officials are not sure why the wooden vessel sank and won't know until it can be raised out of the water.