Dewald Township is a township in Nobles County, Minnesota, United States. The population was 291 at the 2000 census. According to the United States Census Bureau, the township has a total area of 36.0 square miles, all land. The Buffalo Ridge, the drainage divide between the Mississippi and Missouri Rivers systems, extends through Dewald To…Dewald Township is a township in Nobles County, Minnesota, United States. The population was 291 at the 2000 census. According to the United States Census Bureau, the township has a total area of 36.0 square miles, all land. The Buffalo Ridge, the drainage divide between the Mississippi and Missouri Rivers systems, extends through Dewald Township. The Little Rock Creek and the Kanaranzi Creek both flow through the township.