The track crosses a river at the start and then climbs up a big ridge, and descends the other side to stop at the Motu river. Its about 35km or so, but the pace is fairly slow with a few slips, washouts and lots of overhanging foliage. A few ruts and cross axles. I think DOC permission is required now.  When we went through there was one culvert that was getting cut away on both sides like an hourglass that was in danger of closing the track. 

There are some  rough campsites at the river, where we stayed and camped the night.