Park in the Passage du Tour car park on the D435 shortly after Beauregard. There are several parking spaces along the road, before and after the starting point of the hike.
(S/E) Take the path on the right, marked by a raised barrier. You will come to a crossroads at a place called Champ Riant.
(1) Take the path uphill to the left. Stay on this path, following the Ravin de l'Écalon. Shortly before the waterfall, you will reach a crossroads in a hairpin bend.
(2) Continue to the right to reach the wall of the Cascade du Dégoutte-Eau waterfall.
(3) Retrace your steps to return to the Passage du Tour car park (S/E).