This object remained stationary in the sky for some time according to the witness who photographed it. For this reason, it probably isn’t a fragment of a high-altitude contrail. The story sourced here comments that it would appear to be similar to the objects described by Kenneth Arnold seen near Mt. Rainier in 1947

Story Source:
http://thechurchofufology.blogspot.com/2013/06/picture-of-ufo-in-minnesota.html