The track is located out IH 10 toward Houston, just 5 minutes outside 1604.  Taking IH 10 east, exit Trainer Hale Rd.  Once you exit, you'll make a sharp right turn onto the access road.  WARNING:  THIS IS A 2-WAY ROAD.  Go about 100 feet and the track entrance is on the left.

See the aerial photo below for more detail.