Emergency management officials say the damaged structures include cattle sheds, garages and storage sheds. One photo of damage showed cattle standing amid twisted metal that was once their shelter.
Dodge County Emergency Management Director Joseph Meagher says in a statement there have been no early reports of significant damage to houses. There were no reports of injuries.
County officials are working with the National Weather Service to determine what type of wind caused the damage Sunday morning.
Severe storms moved through southern Wisconsin counties Sunday, and much of the area is under a tornado watch until 4 p.m.
The watch includes the Madison and Milwaukee areas.