The Hérisson river is formed by the confluence of two streams flowing from the lakes of Bonlieu and Ilay.
The name 'Hérisson' translates to 'hedgehog', though it is believed to be a linguistic shift from the local dialect word 'irisson', meaning 'the spray'.
The Grand Saut waterfall features a cave behind the curtain of water, though access is strictly prohibited for safety.
The site hosts a Maison des Cascades visitor center located at the top of the trail in Ilay.
The geology of the region is primarily Jurassic limestone, which contributes to the specific erosion patterns of the waterfalls.
The trail connects the plateau of the Jura lakes with the bottom of the valley, necessitating a vertical descent or ascent.
The Hérisson waterfalls consist of a series of 31 successive falls and rapids along a 3.7-kilometer course in the Jura Mountains. The river Hérisson originates from the Saut Girard and Saut de l'Éventail, fed by the lakes of Bonlieu and Ilay. The total elevation drop across the entire site is approximately 280 meters. The path follows the riverbed, crossing through a dense forest environment characterized by limestone geology. Major individual falls include the Grand Saut, which drops 60 meters, and the Saut de l'Éventail, known for its fan-like water dispersion. The trail is fully pedestrianized and maintained by the local Jura regional authorities. The area is classified as a protected natural site under the Grand Site de France network.
The viewing platform at the base of the Saut de l'Éventail for a wide-angle shot of the fan-shaped waterfall.
Wear high-traction hiking boots, as the limestone paths become extremely slippery when wet.
Start the hike from the top (Ilay) if you prefer a descent, or from the bottom (Val Dessus) if you prefer a strenuous climb.
Bring a waterproof jacket, as the mist from the major waterfalls creates localized high-humidity conditions.
Attempting to walk the full length of the trail in flip-flops or open-toed sandals.
The path is occasionally closed during winter months or after heavy rain due to the risk of falling rocks and mudslides.
Stay strictly on marked paths to prevent erosion and avoid disturbing the local ecosystem.
