Northeast of Grenoble you can find a huge waterfall with a height of 270 meters called Cascade de l’Oule. Cascade de l’Oule is located at the hamlet Montfort near Crolles in the region Alps, France.
From Grenoble take the A41 to Chambery. Leave the A41 at exit 24 to Crolles. In Crolles drive further on road d1090 until you reach Montfort. Turn left after the roundabout to the Funiculaire. With the Funiculaire you can go up the mountains almost along the waterfall.
Cascade de l’Oule is a huge waterfall with two single drops, short after each other of 100-150 meters. The waterfall is also a Via Ferrata, a trail where you can climb up along the waterfall, with climbing gear. In summertime the waterfall almost run dry but I think early in the season or after heavy rainfall is the best time to visit cascade de l’Oule.