Columbia River search: 13-year-old boy missing after boat sinks in Oregon (VIDEO)

The teen’s father and grandfather were rescued from the capsizing that began as a family holiday.

A 13-year-old boy is presumed drowned after a small boat overturned and sank on Oregon’s Columbia River on May 28, 2012. The boy’s father and grandfather were rescued.

A 13-year-old boy is missing after a small boat overturned and sank in Oregon's Columbia River in a family holiday turned tragic Monday.

The boy's father and grandfather were rescued by a nearby boater, The Oregonian reported.

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A witness watched as the small boat that was anchored got entangled in the anchor line and overturned at about 10 a.m., tossing the three boaters into the cold and fast-moving water, according to The Associated Press.

Rescue crews from several agencies in Oregon and Washington state were searching for the boy, although authorities said the search had become a recovery effort by about noon, Portland, Ore., TV station KGW reported.

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A US Coast Guard helicopter and a specially trained dive team were assisting recovery crews, according to KGW.

A fisherman told Portland TV station KATU that a cooler, life jacket, hat and other debris could be seen floating in the water.