The $3.8 billion, four-state pipeline would skirt the tribe's reservation, and the tribe says it would endanger its drinking water and cultural sites.
More than 200 protests are set to take place in a "Day of Action" called for by indigenous leaders in support of the Standing Rock Sioux tribe and in an effort to urge the Army Corps of Engineers and USA government to stop the pipeline, according to Dallas Goldtooth, a spokesman for Indigenous Environmental Network, one of the organizers.
Standing Rock Sioux members and their supporters protesting the Dakota Access Pipeline just got a piece of good news. The $3.8 billion pipeline that will carry North Dakota oil to a shipping point in IL is largely complete outside of the Missouri River reservoir crossing in North Dakota.
"This action is motivated purely by politics at the expense of a company that has done nothing but play by the rules it was given", Chief Executive Kelcy Warren told Reuters.
The MAIN Coalition, a group that supports the pipeline, called the decision "extrajudicial" and "political".
Energy Transfer Partners said it will finish the pipeline by December 1 except for a small disputed section in North Dakota, and expects it to begin moving crude in the first quarter next year if the government clears the final obstacle.
Hundreds of people have been arrested during the weeks of mass protest over the $3.7bn (£2.8bn) Dakota Access construction project.
And now they are once again facing off with the government because the Army Corps of Engineers (ACE) has reversed itself and said that work on the Missouri River crossing can't proceed without additional "input" from the tribes.
In its statement, the Army said that its previous decisions "comported with legal requirements". However, it added that it was "mindful of the history of the Great Sioux Nation's repeated dispossessions, including those to support water-resources projects". It said it would finish the pipeline within 120 days of getting approval for the easement.
Previously, Boasberg ruled against the Standing Rock Sioux Tribe when he denied the tribe's request for an injunction that would have halted pipeline construction. If there is even a chance that the government will bow to the demands of the protesters, what happens to the tens of millions of dollars that Energy Transfer Partners has already dumped into this endeavor?
Dakota Access's developers did not immediately have comments on the decision Monday. Government officials have not said how long the process would take, according to a source familiar with the matter.
The Obama Administration has been supportive in the past of the protection of tribal lands.
The North Dakota Highway Patrol says a large group of Dakota Access protesters has caused the state Capitol in Bismarck to be locked down.
The likelihood of different government policies in two months could make for a limited delay in the project, said Rick Smead, managing director of advisory services for RBN Energy in Houston.
"We want actions to bring environmentalism more into the conversation", said Laura Cowie-Haskell, 21, of Boston, one of the organizers of the protest.
Jan Hasselman, a lawyer for Earthjustice who has represented the tribe, said he expected the Obama administration to make a final decision on the easement before the president leaves office January 20.
More than 200 protests against the pipeline are planned across USA cities on November 15, according to organizers of the demonstrations.
Protests were a factor in the Obama administration's decision to delay the line's completion in September and ask for further review from the U.S. Army.