WATFORD CITY, N.D. — Oil spilled in McKenzie County has flowed into a creek, according to the North Dakota Department of Environmental Quality.

The spill by True Oil occurred about 17 miles southwest of Watford City on Friday, March 27, and was reported to the state the same day. The cause of the spill is still under investigation.

According to a release by Bill Suess, program manager with the Spill Investigation Program of the Department of Environmental Quality, the crude oil flowed into Red Wing Creek, impacting approximately 1.5 miles of the creek.

"The spill has been contained and cleanup operations are proceeding," Suess said. "Personnel from the NDDEQ are inspecting the site and will continue to monitor the investigation and remediation."

True Oil LLC has not yet estimated the volume of crude oil released.

The latest spill marks the second reported crude oil spill and sixth energy related spill in McKenzie County over the previous 12 months. The previous crude oil spill in December involved an equipment failure and resulted in more than 480 barrels (20,160 gallons) of oil to have leaked from a facility near Watford City.