The Rive dam discharges its waters into the Gier reservoir which itself relies on the Soulages dam further south. The view from the dam allows you to see the downstream dam and the Gier water reservoir.
Built in 1858 to supply Annonay with drinking water, the Ternay dam offers a pleasant path of about 4 kilometers, called the "Chemin de Ronde", lined with Cedars of Lebanon and some redwoods goes around this 30-hectare lake.