Due to harsh weather conditions that persist throughout most of the year, Alaska’s oil infrastructure is particularly vulnerable to weather-related accidents and disruptions. The worst accident occurred in March 1989, when the tank vessel "[[Exxon Valdez]]" struck Bligh Reef and spilled 260 thousand barrels of oil into the Prince William Sound. | Due to harsh weather conditions that persist throughout most of the year, Alaska’s oil infrastructure is particularly vulnerable to weather-related accidents and disruptions. The worst accident occurred in March 1989, when the tank vessel "[[Exxon Valdez]]" struck Bligh Reef and spilled 260 thousand barrels of oil into the Prince William Sound. |