Bivouac Envers des Dorées CAS

Bivouac Envers des Dorées sits at 2,983m on the north face of Mont Blanc du Tacul, reached via the Vallée Blanche from Chamonix. The approach takes 4–5 hours from the Mer de Glace: ski or walk across the glacier to the foot of the Envers des Dorées couloir, then scramble 200m up mixed terrain to the bivouac. This is a serious alpine approach—glacier travel and crevasse rescue skills are essential. The site sits on the Parc National des Écrins boundary in exposed terrain with significant rockfall and avalanche risk depending on season and conditions.
This is a bivouac shelter, not a staffed hut. It provides a basic stone refuge with space for roughly 10 people and an emergency food supply. There is no guardian, no heating, no water source on-site. You carry everything in. The shelter offers protection from wind and weather but demands self-sufficiency and route-finding experience. Most climbers use it as a staging point for Mont Blanc du Tacul (3,930m) or Chamonix's other high mixed-climbing objectives. Snow and ice make it inaccessible roughly November to April; the main season is June to September.
This is unmanaged shelter open to mountaineers year-round at no charge. Expect overcrowding in July and August—arrive early in the day or plan for winter conditions and bivouacking outside. Bring a stove, fuel, water, emergency shelter, and a headtorch. Check avalanche and rockfall conditions with guides from Chamonix before committing. Do not rely on the emergency rations for regular meals.