Definition
Lac d'Icogne is a natural alpine lake and reservoir located in the canton of Valais, Switzerland. It lies within the municipality of Icogne, near the town of Sion, and is part of the Rhône valley watershed.
Overview
The lake occupies a glacially carved basin at an altitude of approximately 1,500 meters (4,921 feet) above sea level. It functions both as a scenic natural feature and as a component of the region’s hydro‑electric infrastructure. The surrounding area is characterized by steep mountainous terrain, alpine meadows, and forested slopes, making the lake a popular destination for hiking, birdwatching, and other outdoor recreation during the summer months. In winter, the lake often freezes, and the vicinity is used for snowshoeing and cross‑country skiing.
Etymology / Origin
The name “Icogne” is derived from the local French‑speaking toponymy of Valais. It is believed to originate from a pre‑Roman or early medieval personal name Icognus or a Celtic root referring to a water‑related feature, combined with the French suffix “‑ogne” that denotes a place. The term “Lac” simply means “lake” in French.
Characteristics
- Geography: Situated in the western Alps, the lake lies at the foot of the Dent de Morcles and is fed primarily by mountain streams and seasonal snowmelt.
- Surface area: Approximately 0.15 km² (15 hectares).
- Maximum depth: Around 30 meters (98 feet).
- Hydrology: The lake’s outflow contributes to the Icogne River, which joins the Rhône River near Sion. Water levels are regulated for hydro‑electric generation by a small dam at the lake’s eastern end.
- Flora and fauna: The littoral zone supports typical alpine aquatic vegetation such as water crowfoot (Ranunculus spp.) and pondweeds (Potamogeton spp.). Fish species include brown trout (Salmo trutta) and alpine bullhead (Cottus poecilopus). The surrounding habitats host a range of bird species, notably the Alpine chough (Pyrrhocorax graculus) and the Eurasian wryneck (Jynx torquilla).
- Climate: The lake experiences a sub‑alpine climate, with cool summers (average July temperature ≈ 13 °C) and cold, snowy winters (average January temperature ≈ −3 °C).
Related Topics
- Hydroelectric power in Valais – The lake is integrated into the canton’s network of small hydro‑electric facilities.
- Alpine lakes of Switzerland – Lac d'Icogne is one among numerous high‑altitude lakes formed by glacial activity.
- Municipality of Icogne – The local administrative area that encompasses the lake and surrounding villages.
- Rhône River basin – The larger river system into which the lake’s outflow ultimately drains.
- Ecotourism in the Valais Alps – Activities such as hiking, fishing, and wildlife observation associated with the lake.