Ok, so Coles creek is about where the "a" in Br"a"zos is for WotB
Kerr's settlement looks to be south of Sommerville, but north of Brenham. Maybe Gay Hill.
The road running from Washington through Independence, to Kerrs is the La Bahia Road. If you are a motorcyclist, it's a fantastic ride.
Coles Mill looks like it might be pretty close to Snook.