Crews, including TransCanada specialists from emergency management, engineering, environmental management and safety, as well as nationally recognized experts, are assessing the situation.
Greenpeace is also urging Nebraska officials to say no to the new pipeline.
Brian Walsh, an environmental scientist manager at the South Dakota Department of Environment and Natural Resources, said the state has sent a staff member to the site of the leak in a rural area near the border with North Dakota about 402 kilometres west of Minneapolis.
But Walsh says the delay isn't a major concern.
"A TransCanada crew shut down the pipeline at 6 a.m. Thursday, but not before the controversial project leaked around 210,000 gallons of oil about 35 miles south of a pumping station in Marshall County, S.D". That's the equivalent of 5,000 barrels of oil.
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Trump said the new pipeline will be a big win for American workers, but critics say it won't be, because most of the jobs would be temporary. She'll serve Friday supper and a middle-of-the-night shift meal for 80 people, with meals for 100 people on Saturday. She says: "It's nearly like everybody's fears have come true with it".
TransCanada is seeking approval from the Nebraska Public Service Commission for the final section of a second pipeline project, the Keystone XL. Lawmakers argued at the time that pipeline safety was a federal responsibility that pre-empts state law.
The 210,000-gallon spill occurred on private agricultural land in Marshall County, northeast of Aberdeen.
TransCanada said Thursday that the section of Keystone pipe that was leaking was isolated within 15 minutes after a drop in pressure was detected. He said the proposed XL pipeline would be built over huge swaths of porous, sand-like soil atop the Ogallala aquifer, putting farmers and ranchers at risk of water contamination if a spill occurs.
The Keystone Pipeline system runs from Alberta, Canada, to the Gulf Coast.
The company said the pipeline was shut off from Hardisty in Alberta to Cushing, Oklahoma, and to Wood River and Patoka in IL.
For comparison's sake, the Keystone pipeline experienced a previous leak in April 2016 that, at 16,800 gallons (or 400 barrels), was much smaller in scope. In 2010, the first year it was in use, there were 35 Keystone leaks in the U.S. and Canada. "The Nebraska Public Service Commission should look to today's disastrous leak as Exhibit A when commissioners decide in the coming week whether to allow Transcanada to extend this hazardous pipeline through their state". The pipeline has faced hurdles, however, and environmental groups have sued to block its construction.