Upstream of the already-obscure Willies Falls are a series of cascading waterfalls that are even more obscure than their downstream neighbour, as not only are they not named on maps but aren't even marked by a blue line as a waterfall that exists. Nonetheless, with two main tiers dropping about 15 and 10 metres respectively, plus some smaller falls both up and downstream of the main sections, it is a reasonably impressive complex.
Crabtree Rivulet Falls have no track accessing them, and the hike is considerably more challenging than the already-difficult Willies Falls hike due to the terrain surrounding the creek. To reach the falls, take the same route as for Willies Falls, following the Jefferys Track for 1.8km from the Mitchell Road junction, before turning left onto an overgrown old 4WD track. Follow this track for a little while before heading left into the forest and starting the descent to Crabtree Rivulet. It's recommended to not go too far along this track, and aim for a point in the creek not a long way upstream of Willies Falls, as further upstream the steep bank leading to the creek becomes extremely scrubby and choked with cutting grass.
Once you reach the rivulet, make your way upstream, often a difficult task with logs choking the creek, and scrubby, steep banks to negotiate. You will eventually come to some smaller lower sections of the waterfall, before arriving at the first major drop. Unfortunately this one is totally covered with logs and is almost impossible to see properly let alone photograph. With extreme care it is possible to climb through the forest to the left of the falls, and once you make it up the impressive 15 metre high main falls are only a short distance upstream. While very difficult, it is possible to climb higher, however there are only small cascades above so it's not really worth the effort.
While they are an interesting set of falls, the tough hike and better falls downstream means that Crabtree Rivulet Falls are really only worthwhile for the the most hardcore waterfall baggers, and if time is at all limited when in the area Willies Falls are certainly a better destination to attempt.
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Distances are measured 'as the crows fly' and are not reflective of road distance or hiking distances.