Riverdale is a town in McLean County, North Dakota, United States. The population was 223 at the 2020 census.
Garrison Dam, near Riverdale. U.S. Army Corps of Engineers, Garrison Project Headquarters are in Riverdale.
McLean County, North Dakota
McLean County is a county in the U.S. state of North Dakota. As of the 2020 census, the population was 9,771. Its county seat is Washburn.
Historic McLean County Courthouse, now Historical Museum.