Thanks to a poster over on this week's ONTBIRDS thread, I went to Campbellville/Milton to see if I could view a Louisiana Waterthrush. Sure enough, just as that poster described, I found them easily in the exact location given. They were very vocal thus easy to find. I do not know how many, but seemed like there were a few and they were very hyperactive.
Go over to ONTBIRDS to find directions to the location. You won't be disappointed.
