It took place 100 years ago and was much bigger than the current BP spill [though it still needs to be totally played out.] It is known as the “The Lakeview Gusher” and began in 1910 when an oil line in California failed and exploded releasing a geyser of 90-100,000 barrels of oil a day and lasted for a year. Drilling at the depth of over 2,225 feet an explosion occurred and the well erupted.

For more information here is a great news report from CNN: