TransCanada has indicated that the pipeline from Hardisty, Alberta, to Cushing, Okla., and to Wood River/Patoka, Ill., is expected to remain shut down.
"Just days before the Nebraska Public Service Commissions decides on whether to approve Keystone XL we get a painful reminder of why no one wants a pipeline over their water supply", said Greenpeace campaigner Mike Hudema.
Crews shut down the pipeline about 6 a.m., according to the company's website, after a drop in pressure was detected in its operating system resulting from an oil leak that is under investigation. The Keystone XL pipeline has been opposed by environmental and Native American groups since it was proposed previous year.
The Keystone pipeline has leaked more than 200,000 gallons of oil in South Dakota, the company for the project said on Thursday.
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"Ultimately, the cleanup responsibility lies with TransCanada, and they'll have to clean it up in compliance with our state regulations", Walsh said.
The pipeline would transport oilsands oil from Alberta through Montana and South Dakota to Nebraska, where it would connect with existing pipelines that feed Texas Gulf Coast refineries.
The 210,000-gallon spill occurred on private agricultural land in Marshall County, northeast of Aberdeen.
A leak and spill in southeastern South Dakota in April 2016 prompted a weeklong shutdown of the pipeline. The company said it's working with state regulators and the Pipelines and Hazardous Materials Safety Administration to assess the situation. Nebraska regulators plan to announce their decision next week.