The Leatham River route runs up a scenic valley in the Tasman region, climbing to Barbers Hut with several huts along the way, including Cave Hut roughly 6km before Barbers and Lower Gordon hut further along. Expect smooth gravel up to the Branches track turnoff, then typical to-the-hut 4WD terrain with rocky sections and numerous river and stream crossings. The crossings tend to deepen toward the top, and the river exits before Barbers Hut and Lower Gordon are the most technical points on the route — a snorkel is preferable. It's a popular trip with hunters, and many run lower tyre pressures for the rocky going. There are great valley views throughout, and a swing bridge is a nice surprise along the way. Weather has a big influence on the crossings, so check the forecast and take your time to enjoy a stunning part of the country.