The Canyon County Museum is located in the 1903 Oregon Short Line Union Pacific Railroad Depot in historic downtown Nampa. Nampa was on the main line of the Oregon Short Line Railroad and was the junction point for the Idaho Northern, the Boise, Nampa and Owyhee Railroad and the Idaho Central Railroad. Newspapers of the time reported that the Nampa Oregon Short Line Depot would be the finest on the line at a cost of $30,000 to $40,000. The 1902-1903 Depot is an interesting blend of Romanesque, Renaissance, and Baroque elements. It is probably the most outstanding example of Baroque architecture in Idaho.