It rises in west central North Dakota, in the Killdeer Mountains in Billings County. It flows east, and is joined by Spring Creek near Beulah. It joins the Missouri north of Stanton, at the Knife River Indian Village National Historic Site. Billings County is a county located in the state of North Dakota. ... Spring Creek is a tributary of the Knife River, approximately 50 mi (80 km) long, in western North Dakota in the United States. ... Beulah is a city located in Mercer County, North Dakota. ... Stanton is a city located in Mercer County, North Dakota. ...