The pipeline has a capacity of 25,000 barrel per day, and runs from Berthold, North Dakota to Steelman, Saskatchewan, Canada, reports Reuters.
A relief valve at the pumping station broke off leading to spill about 20 barrels of oil, with small amount of oil reached to a marshy area.
Enbridge spokeswoman Lorraine Little said that the Berthold pumping station and the pipeline had been restarted on 26 September 2011.
The spill is just a fraction of the more than 20,000 barrels that spilled into a Michigan river, when Enbridge’s Line 6B ruptured in July 2010.
