An aging 75-foot boat with several hundred gallons of diesel fuel on board sunk off Willow Grove on Tuesday morning, and the Coast Guard and other agencies worked into the evening to clean up the leaking fuel.
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.