About 20 gallons of crude spilled into a nearby waterway. The environmental impact is currently being determined, said an Enbridge representative. No injuries have been reported.
Both the 193,300 barrel per day Spearhead pipeline and the 600,000 bpd Flanagan South pipeline carry oil from Illinois to the storage hub of Cushing, Oklahoma.
These are two of the main conduits for Canadian heavy crude to reach the Gulf Coast. The closure of the lines means crude may get bottlenecked in Alberta, a factor that could potentially push the Canadian crude differential even wider.
No word on how long the pipeline will remain shut.