[mou] Black and White warbler?

[Larry Sirvio]

I saw a bird that looked like a black and white warbler at my bird bath this 
evening. At first I thought it was a nuthatch (one lives in the 
neighborhood) but the patches of black and white were striped not solid like 
the nuthatch. It looked like a female with the area behind the eye not as 
black as the male and the breast area was streaked black and white. Does 
anyone know if black and white warblers could be seen in Washington Co in 
July? I've never seen one in my back yard at any time prior to today.
Thanks
Larry Sirvio
Cottage Grove