Built at a cost exceeding $8 billion after years of engineering battles with permafrost, earthquakes, and migrating caribou herds, the pipeline began pumping oil south from the Arctic fields at Prudhoe Bay. It became one of the largest privately funded construction projects in history and a crucial artery for U.S. domestic oil supply for decades.
The 1973 Arab oil embargo had exposed America's vulnerability to foreign energy suppliers, giving urgent political momentum to a pipeline project that oil companies had been eyeing since the discovery of Prudhoe Bay's vast reserves in 1968. Environmentalists fought the project fiercely, warning of irreversible damage to Alaska's fragile tundra and wildlife.
Engineers faced extraordinary challenges: much of the pipeline had to be elevated above ground on special supports to avoid melting the permafrost, which would otherwise destabilize the structure. Special radiator-like fins dissipated heat from the hot oil, and the pipeline was built in a zigzag pattern to allow it to flex during earthquakes—a design that proved its worth when a major quake struck in 2002 without rupturing the line.
Thousands of workers descended on Alaska during construction, transforming small towns into boomtowns virtually overnight. When oil finally began flowing on June 20, 1977, it took several days to complete its journey; the first tanker loaded at Valdez shortly after, marking the practical culmination of one of the era's most ambitious engineering feats.