Hugh,
I walked through that area in 2016 and again in 2017. On my second visit I couldn't believe how much the scrub had grown in just one year.
The old logging road that starts on Nattai Rd about 400\500m before the Wattle Ridge car park is what Sloss calls the Disappointment Trail. Once you get to the rock cairn and the trail turns up the hill then it becomes what is known as the Horse Trail and goes back to Nattai Rd about 100m past the NP gate at the Wattle Ridge carpark.
Hughmac wrote:This eventually hits a tee intersection. If you turn left it peters out at the top of a hill.
I am pretty sure I know where you are talking about. If turning left the trail continues up the hill and becomes a wide, easy to follow fire trail that NPWS cleaned up to do the hazard reduction burn. It goes all the way back to Nattai Rd about 1km south of the Troys Creek FT turn off. Makes for a good loop walk in either direction. You may find some info in this thread by Kanangra useful:
http://bushwalk.com/forum/viewtopic.php?f=36&t=26119.
Hughmac wrote:if you turn right it takes you over one small ford, around the shoulder of a hill, then over a ford on Martins Creek.
Sounds like you missed the turn off down to the waterfall and mini canyon. As you go around the shoulder of the hill look for a small cairn and some flag tape on the left hand side of the track. This takes you down an overgrown track to a nice waterfall and mini canyon. Also, to my knowledge this is the furtherest you can get down Martins Creek by trails. From here it is off-track for several kilometres until you can pick up the old road that came up Martins Creek from the Nattai River.
Hughmac wrote: Another oddity is that someone at some point has cleared both of these old roads of small regrowth with a chainsaw, even though it must be decades since either was accessible to vehicles.
Those trails were cleaned up as part of the hazard reduction burns done a few years back. As the burn-off didn't go any further down the creek the track to the waterfall did not get cleaned out. I was lucky on my first trip down there to have someone with me who had done the walk before and showed me the waterfall turn off. Without this help I would have walked straight past it.
Sounds like you had a good walk.
Cheers,
Michael.
One foot in front of the other.