 Keystone pipeline shut after major oil spill. Keystone pipeline running from Canada to Texas has been shut down due to oil spill in Kansas. Over 14,000 barrels of crude oils spilled into meal creek in Washington County on Wednesday in the largest US crude oil spill in years. The cause of this spill is being investigated. It's also unknown how much oil has been spilled and how long the pipeline system is expected to be down. Environmental specialists have said that the leakage has not affected the drinking water in that area. The pipe sun operator Canada-based TC Energy has said it would remain on site to help with cleanup efforts. This is a third and largest spill on the Keystone pipeline since it was put into operation back in 2010.