Pasadena Road is a right turn off of route 539, just a mile or two after 539 crosses route 70. It's a little confusing because, although there is a sign shortly before Pasadena Road that says "Pasadena Road", there is also a sign whose road name begins with an "M". Mahone or something or other. From Route 72, just before the railroad overpass, Savoy Road comes in. It is a left turn if you are coming from the north, traveling south. Follow it for a few miles and it crosses the tracks and becomes Pasadena Road. Both Savoy and Pasadena Roads are paved, but will take you to sand roads. There are three that come in just across from the railroad crossing that enter the Pasadena Wildlife Management Area. The futhest on the left, if you cross the tracks, is the one that goes towards Old Half Way.
In addition to the two Hidden Lakes at Old Halfway, there is a lake on the other side of the railroad tracks from Savoy Road which runs roughly between where Savoy Road crosses the tracks and the Sand/Gravel mine (or whatever) as you go towards route 72.
Jeff