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Go crazy :)
Official mapmakers have not liked waterfalls ever since the first surveyor fell into one.
A lot of interesting waterfalls have been quietly scrubbed from public maps. Sometimes the reasons are understandable - these places are dangerous. Sometimes the reason is local landowner pressure which is not acceptable as most Australian waterfalls are on public land and most landowners get road improvements if there is a natural feature nearby.
A little while back Google Maps stopped adding water features to its basic map at the suggestion of local guides. It turns out that some of the local guides (some of whom were local landholders) were evil and made changes that left the map in a bit of a mess (some of this has been sorted out but you can still see an echo of the mess in the name of one of the largest dams on Australia's longest river - instead of Lake Hume, it is called Lake Huma on the map - a bit embarrassing). Instead of local guides, Google has relied on government advice (which in this country does not bear thinking about). Consequently, Google Maps is a bit hit and miss when it comes to water features.
The good news is that it is now possible to curate public lists which people can follow on the map. To help you find features included on the map, i have started to build a list of all waterfall features in South Eastern Australia. Of course, if Google does not add a feature (like the reopened Carrington Falls lookout or the Tulloch Ard lookout or the Fiddlers Creek Falls) this list will not include them. On the plus side, curating such a list give you access to photos from all of those people (and their reviews) as well as mine :)
The curated list is HERE :) make sure to follow it so you can find it again and get updates :)