Don't know for sure about ID'ing that scat but black bears have been south of Bay City. One was hit on I-75 near Flint a year or two ago and also had one spotted near Owosso around the same time frame. The only Bear scat I've seen was in the U.P. and it had a ton of blueberries in it and it was a very large pile. Probably 3 times the size of what's in your pic.