One in a series of geocaches placed between Dubbo and Narromine to make your trip longer. haha.
You can drive right down to the river for a paddle or fish. You may even be able to cross over to the reserve on the others side and drive on to Terramungamine or Rawsonville or wherever.
This one is a micro and easy to find... unless it is flooding. Please be sure to replace the same way as you found it and let me know in your comments if maintenance is needed.