Mathinna Falls is an impressive waterfall with satisfying volume and good height. I've seen reports that the falls consists of four 17m drops or that it's 80m tall. However, when you walk the 30-minute return track from the car park and picnic area, you'll only see perhaps 25-30m so I reckon the rest of it must be hidden. Either way, it's very worthwhile and it's also close to the Evercreech Forest Reserve.