The Exxon Valdez held twice the amount of oil Keystone pipeline carries.. 1.4 million barrels versus 700,000 barrels. When the Valdez spill was from 257,000 to 750,000 barrels. The accident occurred 22 years ago and in the USA no other accident has occurred. So at any one mile of the 2,147 miles the oil travels in the pipeline. Dividing 700,000 barrels by 2,147 miles that means 326 barrels are in one mile of pipe! The Alyeska 700,000 barrels per day pipeline'slargest oil spill involving the main pipeline took place on February 15, 1978, when an unknown individual blew a 1-inch (2.54-centimeter) hole in it at Steele Creek, just east of Fairbanks. Approximately 16,000 barrels (2,500 m3) of oil leaked out of the hole before the pipeline was shut down. After more than 21 hours, it was restarted. So which is a bigger risk? ONE supertanker carry 1 million barrels each day running the risks of: 1) bad weather delaying 2) bad weather causing accident 3) ship collision? 4) Ship fire? Versus at most 16,000 barrels?? Which is worse?