One in a series of geocaches placed between Dubbo and Narromine to make your trip longer. haha.
Before Narromine existed there was Timbrebongie. The Falls Rd was the original "highway" through this part of the country. You can drive right down to the river through a property and have a swim, kayak, etc, there.
This one is a micro and easy to find. Please be sure to replace the same way as you found it and let me know in your comments if maintenance is needed.