Exxon Valdez Grounds in Prince William Sound

Context

In the decades after the 1977 completion of the Trans-Alaska Pipeline System, the port of Valdez became the southern terminus for North Slope crude oil bound for refineries in the lower forty-eight states. Tankers navigated the narrow passages of Prince William Sound, a remote and ecologically rich fjord system, under a traffic-separation scheme overseen by the U.S. Coast Guard. By the late 1980s, single-hulled vessels remained the industry standard, and contingency plans for a major spill in the sound had never been fully tested at scale.

What Happened

The Exxon Valdez, operated by Exxon Shipping Company, completed loading at the Alyeska Marine Terminal late on March 23, 1989, and departed shortly after 9 p.m. with roughly 53 million gallons of crude oil aboard. Harbor pilot William Murphy guided the ship through the Valdez Narrows and departed at 11:24 p.m., leaving Captain Joseph J. Hazelwood and Third Mate Gregory T. Cousins on the bridge. Hazelwood soon retired to his cabin, leaving Cousins in command with instructions to return to the outbound traffic lane after avoiding icebergs. At approximately 12:04 a.m. on March 24 the vessel struck Bligh Reef, rupturing eight of its eleven cargo tanks.

Aftermath

The spill eventually released about 11 million gallons of oil that spread across more than 1,300 miles of shoreline. Initial containment efforts by Alyeska and the Coast Guard proved inadequate amid high winds and remote logistics. Exxon ultimately spent more than $2 billion on cleanup involving thousands of workers, while wildlife rescue teams documented heavy mortality among seabirds, sea otters, harbor seals, and other species. Fisheries in the sound were closed for the season, devastating local economies.

Legacy

The disaster directly led to the Oil Pollution Act of 1990, which mandated double-hull construction for new tankers, established stricter liability rules, and created a national oil-spill response framework. The incident also accelerated the phase-out of single-hulled vessels in U.S. waters and heightened public and regulatory scrutiny of the petroleum transport industry. Long-term monitoring has shown persistent ecological effects in parts of Prince William Sound, informing subsequent debates over Arctic shipping and spill preparedness.