On December 22, 1988, the tug, Ocean Service, collided with the barge, Nestucca, which spilled more than 230,000 gallons of No. 6 fuel oil into the Pacific Ocean near Grays Harbor, Washington. The resulting oil slick dispersed over 800 square miles from Grays Harbor north to Vancouver Island, British Columbia, Canada and south to Oregon. Shorelines were oiled within Grays Harbor and along 110 miles of the Washington State coast north of Grays Harbor and into the Strait of Juan de Fuca. Oil washed ashore on portions of Oregon State and Vancouver Island, British Columbia coasts. More than 13,000 oiled seabirds were collected by wildlife rescue and rehabilitation operations conducted during the spill. Estimates of actual migratory bird mortality from the spill ranged from 4 to 6 times greater than that collected.