A really spectacular route climbing alongside a huge waterfall but not easy with long reaches and some steep sections.
From the parking in a layby on the D1091 cross the road and follow the obvious path with Via Ferrata signs. This narrows to a smaller track leading towards the waterfall. Once on the cable the route climbs for a short while and then crosses a series of ledges leading up and leftwards. It turns a corner and gets steep as it heads up a hanging corner, using staples and good rock holds. This section can feel long and strenuous. After this the angle eases a little and as it gains height it gets closer to the waterfall (you may get some spray from it on a windy day). Some of the moves require good balance and can feel exposed, the final section eases.
From the end of the cable, the path leads up and right and then winds back towards the river. Go past the avalanche warning system that crosses the stream to a bigger path, crossing the stream here. The path leads to the Refuge des Clots, a great place to get refreshments and enjoy the amazing scenery. The path continues marked with signs and red dots, bringing you back to the cliff edge and cable. Descend the zig zag path, then a traverse leads to more zig zags on steep scree, care needed. It leads back to the waterfall and you have to cross the stream again to meet the walk-in path.
Warning - you have to cross the stream at the top of this route and again at the bottom. It is worth checking levels before you start the via ferrata as it can vary a lot depending on past weather. It should be a few metres across and not very deep, and you should be able to cross with care using rocks in the stream.