BISMARCK, N.D. — Officials say an emulsion spill has reached a creek in southwestern North Dakota.

The North Dakota Department of Health says the spill was discovered 8 miles southwest of Rhame in Bowman County on Monday and was reported the same day. Oil emulsion is a mix of crude oil and produced water from a well.

Officials say a flow line owned by Denbury Onshore LLC leaked. Initial estimates indicate about 420 gallons of produced water and 84 gallons of oil were released, with some of the produced water and crude oil reaching Spring Creek.

Staffers from the Health Department and the North Dakota Industrial Commission are inspecting the site and will continue monitoring the investigation.