The Morton County Sheriff's Office estimated 400 protesters were seeking to get past the bridge on state Highway 1806 in what they called "an ongoing riot." Law enforcement had formed a line to prevent their movement.
The clash yesterday was at the Backwater Bridge, near where protesters had set up camp on private property owned by the pipeline developer, Energy Transfer Partners, before they were forcibly removed by law enforcement in October.
A video shot by a protester shows what appear to be water cannons and tear gas being fired at protesters.
The 1,200-mile, four-state pipeline is being built to carry oil from western North Dakota to a shipping point in Illinois. But its construction has been protested for months by the Standing Rock Sioux, whose reservation lies near the pipeline route, and the tribe's allies, who fear a leak could contaminate their drinking water. They also worry that construction could threaten sacred sites.
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Energy Transfer Partners has said no sites have been disturbed and that the pipeline will have safeguards against leaks, and is a safer method of transport for oil than rail or truck.
On Friday, Kelcy Warren, the chief executive of Dallas-based Energy Transfer Partners, said the company is unwilling to reroute the pipeline.