The wreck of New Carissa caused one of the most serious oil spills to affect the state of Oregon, and the worst since a 1984 spill near Longview, Washington that dumped 200,000 US gallons (760 m3) of oil into the Columbia River.[25] As Oregon has no significant oil refinery facilities, oil tankers do not often dock at its ports, making the state relatively safe from oil spills.[26] Analysis conducted by the U.S. Fish and Wildlife Service determined that over 3,000 shorebirds and seabirds perished. The birds belonged to more than 50 species.[27][28] Among the birds killed were 262 threatened marbled murrelets and between four and eight endangered western snowy plovers.[29] Harbor seals, fish, and shellfish were also killed or affected. Several beaches were fouled, with tarballs continuing to wash up for more than a month after the wreck.[30]