This answer is spot on. I fish the River Raisin a lot. As far as 3" curly tail grubs go, white, black w/ chartreuse tail, watermelon w/ black pepper are my best colors. Yellow gets hot every now and then.
Tubes work but in my experience the curly tail grub out fishes them. Tubes seem to work best directly below the few dams that are left.
Mepps, Panther Martins and Rooster Tails also do well in the deeper areas.
I fish every where from Dundee all of the way to the mouth of the river.
Since the library area has been mentioned, that is a popular area with the fly fishermen. About a mile up stream and a half mile down stream is good wading. You'll even see a hex hatch in that area as well.
There are also rock bass and northern pike in the river.
Hope this helps.