Prince William Sound, AK (Mar. 24)--The Exxon Valdez remains in place in Prince Williams Sound after running aground. The Exxon Valdez ran aground on Bligh Reef in Prince William Sound, Alaska, March 23, 1989 spilling 11 million gallons of crude oil, which resulted in the largest oil spill in U.S. history. U.S. COAST GUARD PHOTO