Humboldt Museum's ground floor was completed June 5, 1985.  Phase two was finished October 1995.  The two-story building houses an automobile collection on the main floor and a variety of collections upstairs.  It also houses the Weigand Audio Visual room, gift shop, library and staff office space.

The Humboldt Museum overlooks Winnemucca, Nevada, a small town of 7,174 (2000 census figure). The campus and main building command striking views of town, the Humboldt River, and the Sonoma Mountains.

The Museum Thrift Shop building was completed July 15, 1911.  It served as the Nevada Hide and Junk Company. 

The Wiegand Audio-Visual Room was donated by the Wiegand Foundation. It provides visitors with an opportunity to watch short and long films, on request, about Winnemucca, Humboldt County, and Northern Nevada.