The Granby, a wood-hulled work crew vessel built in 1929, sank in 24 to 30 feet of water where it was moored at a dock in Fisher Island Slough, a Columbia River side channel just upriver from Willow Grove County Park.
At 5:20 p.m. Tuesday, state Department of Ecology officials estimated that 50 to 100 gallons of diesel had leaked into the slough. That number could change after divers get a closer look at the submerged boat, authorities said.
A rainbow-colored sheen of fuel was visible on the water’s surface near the shore. A Coast Guard helicopter flew over the area in the afternoon and its crew reported sheen on the river six miles downstream, said Coast Guard officials at the scene.
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