It seems that passerine migration is always a few days behind the twin cities along the MN River. Whereas most of the states' warbler species have been seen in the cities for almost a week now, we are just starting to see those species in places near Henderson and St. Peter, which leads me to suspect that the majority of warblers come up the Mississippi flyway and then some turn southwest and follow the Minnesota River upstream.
This afternoon at Rush River Park south of Henderson I found 16 species of warbler: Blue-winged Golden-winged Tennessee Orange-crowned Nashville Yellow Magnolia Cape May Yellow-rumped Blackburnian Pine Blackpoll Black-and-white American Redstart Ovenbird Common Yellowthroat The majority were definitely Yellow-rumped and Tennessee, but it was interesting to see good numbers of Blackpoll. Equally interesting were several Orange-crowned Warblers and a single Pine Warbler. Bob Dunlap, Nicollet County