Nels J. Brakke

According to the 1910 census in Volin, Yankton, South Dakota, Nels J. Brakke was born about 1845 and immigrated from Norway in 1866. I suspect he may be my gg-grandfather (Johannes Johannessen Brakke [John J. Brakke]'s youngest brother, born Niels Johannessen in Ringsaker, Hedmark, Norway on 3 July 1844. I am not having any luck in finding a ship's record or the Norwegian emigrant record of his departure from Norway. Thank you in advance for any help you can give me in this regard.