Top 15 Largest Oil Spills in History
Wikipedia link. Note that it's been 18 years since a major oil spill of more than 100,000 tons (30 million gallons), the last one was in 1992 in Uzbekistan. And there hasn't been a major U.S. oil spill since 1989 - Exxon Valdez - which ranks #15 by size on this list (and at 30,000 tons doesn't really even qualify for the list?).
HT: Paul Kedrosky