The pipeline was proposed in 2014, and by early 2016 most permits were given and construction started. It continues rapidly, along most of the pipeline route. All resistance so far has only stopped construction locally and temporarily. At the same time, we've already won even if you just look at the progress in movement-building that's happened up to today.

Standing Rock Sioux (North Dakota)

The physical center of resistance that is just now breaking into establishment media consciousness is the Camp of the Sacred Stones (aka Sacred Stone Camp), just north of the reservation where they are contesting pipeline construction under the Missouri. It started on April 1 as a few women praying there every day, and prayer has remained a central activity throughout. Over time more and more people (currently thousands) have come to the camps to visit or join more permanently.

This gathering is "the first time since the 1876 Battle of the Little Bighorn that all seven council fires have camped together. // The Lakota, Dakota, and Nakota are all members of the Océti Sakówin, the seven council fires, commonly known to most Americans as the “Great Sioux Nation." And it's not just the Océti Sakówin - representatives of at least 280 tribes are there or have visited, it is the largest such gathering in over 100 years. (Non-Native allies and indigenous people from other parts of the world have also been there in significant numbers.) Seeds sown by long-time Native organizing, recently including the resistance to Keystone XL, are bearing fruit.

Youth have had a significant role, especially Standing Rock Sioux youth who formed Rezpect Our Water. They wrote powerful letters to the Obamas, who visited the Standing Rock Sioux just two years ago and spoke strong words of solidarity. Oh yeah, and they ran from Sacred Stone Camp to Washington, D.C. (also reported in The Hill and by Redacted Tonight)

With thousands of people there are now multiple camps, and one - Red Warrior Camp, is focused specifically on nonviolent, civil disobedience training and actions. With Sacred Stone Camp, they have put out the call for solidarity actions September 3-17 wherever people live (see map). The request is to focus attention on the banks that are financing the pipeline.

Bakken Pipeline Resistance Coalition (Iowa)

The Iowa-based center of resistance is the Bakken Pipeline Resistance Coalition. As with the tribes, they have been pursuing legal strategies to stop the pipeline for quite a while, including right now supporting a case where 15 landowners are suing the Iowa Utilities Board (IUB), to revoke eminent domain the IUB granted to Energy Transfer Partners. (Eminent domain is only supposed to be used to force the pipeline through landowners’ land without their permission). Since the judge in that case also refused to issue a preliminary injunction against construction while the trial proceeds, they have also started up civil disobedience, but are not yet getting the level of attention the tribes are getting.

EDIT: Actively editing.