With a flip of a switch in Prudhoe Bay, crude oil from the nation’s largest oil field begins flowing south down the trans-Alaska pipeline to the ice-free port of Valdez, Alaska. The steel pipeline, 48 inches in diameter, winds through 800 miles of Alaskan wilderness, crossing three Arctic mountain ranges and hundreds of rivers and streams. Environmentalists fought to prevent its construction, saying it would destroy a pristine ecosystem, but they were ultimately overruled by Congress, who saw it as a way of lessening America’s dependence on foreign oil. The trans-Alaska pipeline was the world’s largest privately funded construction project to that date, costing $8 billion and taking three years to build.

In 1968, a massive oil field was discovered on the north coast of Alaska near Prudhoe Bay. Located north of the Arctic Circle, the ice-packed waters of the Beaufort Sea are inaccessible to oil tankers. In 1972, the Department of the Interior authorized drilling there, and after the Arab oil embargo of 1973 plans moved quickly to begin construction of a pipeline. The Alyeska Pipeline Service Co. was formed by a consortium of major oil companies, and in 1974 construction began.

U.S. conservation groups argued that the pipeline would destroy caribou habitats in the Arctic, melt the fragile permafrost–permanently frozen subsoil–along its route, and pollute the salmon-rich waters of the Prince William Sound at Valdez. Under pressure, Alyeska agreed to extensive environmental precautions, including building 50 percent of the pipeline above the ground to protect the permafrost from the naturally heated crude oil and to permit passage of caribou underneath.

On June 20, 1977, oil began flowing down the pipeline. It got off to a rocky start, however, as power supply problems, a cracked section of pipe, faulty welds, and an unsuccessful dynamite attack on the pipeline outside of Fairbanks delayed the arrival of oil at Valdez for several weeks. In August, the first oil tanker left Valdez en route to the lower 48 states. The trans-Alaska pipeline proved a great boon to the Alaskan economy. Today, about 800,000 barrels move through the pipeline each day. Altogether, the pipeline has carried more than 14 billion barrels of oil in its lifetime.

For its first decade of existence, the pipeline was quietly applauded as an environmental success. Caribou populations in the vicinity of the pipeline actually grew (due in part to the departure of grizzly bears and wolves scared off by the pipeline work), and the permafrost remained intact. The only major oil spill on land occurred when an unknown saboteur blew a hole in the pipe near Fairbanks, and 550,000 gallons of oil spilled onto the ground. On March 24, 1989, however, the worst fears of environmentalists were realized when the Exxon Valdez ran aground in the Prince William Sound after filling up at the port of Valdez. Ten million gallons of oil were dumped into the water, devastating hundreds of miles of coastline. In the 1990s, the Alaskan oil enterprise drew further controversy when the Alyeska Pipeline Service Co. attempted to cover up electrical and mechanical problems in the aging pipeline.

In 2001, President George W. Bush proposed opening a portion of the 19-million-acre Arctic National Wildlife Refuge, east of Prudhoe Bay, to oil drilling. The proposal was greeted with overwhelming opposition from environmental groups and was initially defeated. In 2006, however, the Senate voted 51-49 in favor of a budget resolution that included billions for Arctic drilling. Environmental advocacy groups continue to fight the legislation.

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