The Exxon Baton Rouge, smaller ship, attempts to off load crude oil from the Exxon Valdez in Prince William Sound, Alaska on March 26, 1989. The ship ran aground spilling more than 270,000 barrels of crude oil. Experts call it the United State's worst oil spill ever. (AP Photo)

Photos: Exxon Valdez oil spill 1989

Exxon Valdez oil tanker tanker hit a reef in Prince William Sound, Alaska, on March 24, 1989, spilling more than 10 million gallons of crude…