But the Standing Rock Sioux tribe and several allies, including environmentalists and some veterans, have argued that the project could imperil their drinking water supplies in Lake Oahe, a reservoir created when the Army Corps built dams farther south on the Missouri River.
Jan Hasselman, a lawyer with the environmental group Earthjustice, said the new administration had no right to short-circuit a process started by then-Obama administration officials to scrutinize the project's potential impact on critical resources along the route. Late last year, then-President Barack Obama, after weeks of protests, instructed the corps to look at different route options for the pipeline.
"The Obama administration correctly found that the Tribe's treaty rights needed to be respected, and that the easement should not be granted without further review and consideration of alternative crossing locations," Hasselman said in an email. "Trump's reversal of that decision continues a historic pattern of broken promises to Indian Tribes and violation of Treaty rights. They will be held accountable in court."
Backers of the pipeline, who argue that it is the most effective means of transporting crude oil extracted on the Great Plains, hailed the Army's decision.
"New energy infrastructure, like the Dakota Access Pipeline, is being built with the latest safeguards and technology," said Sen. John Hoeven (R-N.D.) in a statement. "The discord we have seen regarding the Dakota Access Pipeline doesn't serve the tribe, the company, the corps or any of the other stakeholders involved. Now, we all need to work together to ensure people and communities rebuild trust and peacefully resolve their differences."
Brady Dennis contributed to this report.