Recent contact from a distant Illinois Oedewaldt prompted me to google the Oedewaldt name for a little history. I found a wonderful glimpse of history in an electronic copy of "Historical Encyclopedia of Illinois and History of Peoria County" originally published in 1902.
OEDEWALDT, HENRY J.; Farmer and Miner; born in the city of Peoria, August 26, 1856. He is the son of Casper Oedewaldt, born in Prussia, October 25, 1822, died March 14, 1895; and Catherine Odenwelder, born in Baden, Germany, July 28, 1830, and still living; they were married in St. Louis, Missouri, about 1844. The senior Oedewaldt was a carriage maker and established the first carriage and wagon factory in Peoria. In 1857 he purchased the farm where his son, Henry J., now lives. Henry J. Oedewaldt married Mary Colvin at Maple Ridge, November 16, 1881. They have eight children: Sarah Catharine, born November 1, 1882; Cleveland, born March 4, 1885; Henry J., born April 14, 1888; Roger, born September 21, 1890; Snowden, born March 7, 1893; Seth, born June 2, 1895; Goldie, born July 28, 1898, and Adam, born February 10, 1900. Mrs. Oedewaldt's father, Benjamin Colvin, was born in Pennsylvania and died in Indian Territory, April 6, 1900, aged seventy years. He married Margaret Goodwill, who was born in Hollis Township in 1835, and is now living in the Indian Territory. Jacob, the only brother of H. J. Oedewaldt, was born in 1860. He married Flora Calhoun and has seven children. The Oedewaldt family are Lutherans. Henry J. is a Republican, and has served as School Director.
I can remember my grand-mother, married to Roger, referring to Henry, Snowden and Seth. I'm pretty sure I took a car ride across Pekin with Great uncle Snowden back in the summer of 1984. In fact, we may have been on our way to visit Great Aunt Goldie.
So, Casper immigrated from Prussia to Illinois [1840's?] who had Henry  who had my Grandfather Roger  who moved to Montana where my dad, Elliott  was born.
Wow, it would be interesting to fill in some more of this history!