A pipeline spilled an estimated 1200 gallons of crude oil into a dry creek bed near Gillette over the weekend.
The Belle Fourche Pipeline Company, a True Company subsidiary, owns the gathering line responsible for the spill into Donkey Creek.
It’s not clear how long the line was leaking before the company shut it down. The Department of Environmental Quality says it may have been a few days.
In Wyoming, gathering lines are largely unregulated and are not monitored for spills. The company’s report about the spill lists internal corrosion as the cause.