Silver Wattle is at 1063 Lake Road, Bungendore NSW, at the northern most reach of Lake Road. Although some GPS will try to take you there from another direction, the only entrance to Lake Road is off Bungendore Road (see map).
N.B. If using GPS, please note that these will often direct you via farm tracks that are not drivable roads. If using GPS put in 3 Lake Rd, Bungendore, and when you get to Lake Road, drive to the end of the dirt road (about 10km) - you cannot miss it.