Thieves made off with a statue of a boy by cutting through two inches of thick steel at his ankle. The heavy statue was then hauled away.
The statue was found vandalized and missing on Saturday morning by Nancy Driver, a volunteer who helps maintain the park.
"It was a boy who had his arms flung out and he was standing on one foot, and he's now gone, except for that one foot is still there," Driver said.
The popular sculpture, "Walking on Logs," is often decorated by the West Seattle community. The sculpture features four children walking on logs, and is visible as drivers enter West Seattle from the Fauntleroy Way end of the West Seattle Bridge.
The park property is owned by the Seattle Department of Transportation, and a volunteer restoration group keeps it looking good.
Detectives are investigating the theft and ask anyone with information to call police.