A federal judge has refused to stop oil from flowing through the Dakota Access Pipeline, which will likely clear the way for operations to begin next week.

U.S. District Judge James Boasberg denied a request by the Standing Rock and Cheyenne River Sioux tribes Tuesday to stop oil from flowing while the tribes appeal his decision from last week, which will allow construction to finish.

The $3.8 billion pipeline will carry North Dakota oil to Illinois. Texas-based developer Energy Transfer Partners says it could be moving oil as early as Monday. Boasberg says Energy Transfer Partners would be "substantially harmed" by a delay.