family histories

I am looking for immigration records and facts about Olaf Nilsson, wife, A.C. Jansson (jansdotter) and Daughter Brighamina (Brigmine) Olsen. The family Immigrated, according to sketchy family records, about 1880, and settled in Ephiram, Utah. I have some information about them arriving on the ship "Wisconsin". I am holding this questionable because only one person is named instead of the entire family log of the ships list......Frankly, I'm not too sure of the authenticity of the reference...There is not enough information. help!!!! thanks Larry (Bolly)