Thanks! I didn't expect an answer from this ancient thread, but you're right. I did some research and found a historical society Facebook page, who also told me the park was located beyond the corner of North Parade and Belmore Avenue, in what is now an empty gravel yard - right next to the foot bridge. Interesting that also in this thread someone said there was a pool company built after the park closed; I found out it was called Waterworks Homeworld Pools (long gone now), which was 10 Stout Road. Also interesting, if you go into Google Earth and go back to 2004 (the earliest it goes), you can see what looks like a driveway/entrance coming from the N Parade/Belmore corner (but already closed off), and going right past a long building structure that appears to be the old entrance. When you Google image search "mount druitt waterworks" you will see a photo of a three-level roofed building covered with graffiti - I believe that is the structure seen in Google Earth search.
I was surprised throughout this, how quickly local history disappears and isn't recorded on the internet. I even emailed the Manly water park (former sister park of Mount Druitt Waterworks) but they had no idea where it was.
Anyway, thanks again!
Hi. Yes that was my guess too. But was the entire park this big only? I assumed it would have taken up much more land than this. (If only Google had satellite imagery older than 2004; if you could go back to 1981 you would see it all clearly)