Aiguille de Bionnassay
The Aiguille de Bionnassay (elevation 4,052 metres (13,294 ft)) is a mountain in the Mont Blanc massif of the Alps in France and Italy. It has been described as "one of the most attractive satellite peaks of Mont Blanc", and is located on its western side.:51 The mountain's south and east ridges form the frontier between the two countries, and its summit is a knife-edge crest of snow and ice. Reaching it via any route provides a "splendid and serious snow and ice climb".:51
|Aiguille de Bionnassay|
Summit, east ridge and glaciated north-west face of the Aiguille de Bionnassay
|Elevation||4,052 m (13,294 ft)|
|Prominence||164 m (538 ft)|
|Isolation||1.8 kilometres (1.1 mi)|
Aiguille de Bionnassay
Location in France, on the border with Italy
|Location||Haute-Savoie, Rhône-Alpes, France |
Aosta Valley, Italy
|Parent range||Mont Blanc|
|First ascent||28 July 1865 by Edward N. Buxton, Florence Crauford Grove and Reginald S. McDonald, with guides Jean Pierre Cachat and Michel Payot. (north-west face).|
Three significant glaciers originate on the slopes of the mountain: The Glacier de Bionnassay, the Glacier de Bionnassay Italien, and the Glacier de Miage.
The Glacier de Bionnassay is the most obvious glacial feature, arising on the north and north-west slopes of the Aiguille de Bionnassay as well as from the western side of the Dôme du Goûter and the Aiguille du Goûter. It descends for approximately 4.5 km, flowing north-westwards before turning north at the foot of the Nid d'Aigle to end some distance above the settlement of Bionnassay, continuing as the Torrent de Bionnassay. This hanging glacier on the north-west face of the Aiguille de Bionnassay provides a route of access for mountaineers with ice-climbing skills.:202
The Glacier de Bionnassay Italien arises from a cirque between the south eastern side of the Aiguille de Bionnassay, the Col de Bionnassay and the Calotte des Aiguilles Grises. It descends south-south west for 2.5 km below the Col Infranchissable, then turns south-east to merge with other glaciers, thence continuing as the Glacier du Miage (Ghiacciaio del Miage) – a total distance of approximately 9 km, forming the longest glacier in Italy.
The Glacier de Miage – not to be confused with the much larger Glacier du Miage on the Italian side (see above) – forms from snows collecting between the Aiguille de Tricot and the south-western face of the Aiguille de Bionnassay. The glacier descends in a south-westerly direction for approximately 2.5 km.
The first ascent of the Aiguille de Bionnassay was undertaken on 28 July 1865 by Florence Crauford Grove, Edward N. Buxton and Reginald S. McDonald, with guides Jean Pierre Cachat and Michel Payot. They ascended the north-west face to reach the ridge above the Aiguille de Tricot, from where they continued to the knife-edged summit ridge, arriving in a thunderstorm. A detailed account is given below.
- North-West Face: Graded at AD, the route is a steep, glaciated face between 40 and 55 degrees. There are numerous small crevasses in its steep slope providing sufficient resting places to reduce the exposure, but it is a long, demanding route of over 1 km, and can be difficult in times of hard ice. Climbers usually start from the Tête Rousse Hut. It is regarded as the finest route on the mountain, and one of the best of its class in the Alps.:52 After snow it is avalanche prone; in one such incident in 1968 four climbers died.:202
- South Ridge: An ascent from the Col de Miage (Durier Hut) provides the easiest route to the summit. The route consists of snowy ridges, rock ledges and chimneys. It is graded at PD+ with rock pitches of II, often iced. A final steep snow ridge leads to the narrow and exposed summit on the French/Italian border.
- East Ridge: Described as "a superb snow crest which is often precarious and delicate due to large cornices", the east ridge descends from the summit as an exposed and delicate knife-edge crest to the col de Bionnassay. It is graded AD and can be reached from a traverse of the Bionnassay, or from the Gonella Hut.
- West Ridge: A long 3.4 km ascent from the Col du Tricot over the Aigulle du Tricot, graded at PD.
- Traverse: Crossing the mountain as part of a three-day ascent of Mont Blanc involves climbing up the south ridge of the Aiguille de Bionnassay from the Col de Miage, then descending from the summit down its razor-sharp, icy, and often corniced east (frontier) ridge. From there the route climbs again up the west ridge of the Dome du Gouter, past the Vallot Hut, to reach the Bosses ridge and thence to the summit of Mont Blanc. The route has been described as 'a truly magical expedition of ice and snow aretes at great altitude'.:199 The Durier Hut on the Col de Miage can either be reached directly from the village of Tresse via an increasingly broken slope of scree in its upper reaches, or via a traverse from the Conscrits Hut over the Dômes de Miage.:21
- List of 4000 metre peaks of the Alps
- "Cartes IGN (French map portal)". www.geoportail.gouv.fr. Retrieved 22 November 2015.
- Griffin, Lindsay (1990). Mont Blanc Massif Volume 1. London: Alpine Club. ISBN 0900523573.
- Helmut Dumler and Willi P. Burkhardt, The High Mountains of the Alps, London: Diadem, 1994
- "Miage Glacier, Italy". earth.esa.int. European Space Agency. Retrieved 10 November 2015.
- Lloyd, Robert Wylie (1927). A Traverse of the Dent Blanche and the First Direct Ascent of the Aiguille de Bionnassay by the North Face. Spottiswoode, Ballantyne & Company, Limited.
- Goedeke, Richard (1990). The Alpine 4000m Peaks by the Classic Routes (1st ed.). London: Diadem Books. ISBN 3763410074.
- Aiguille de Bionnassay on French IGN map portal
- Entry on SummitPost.org
- Entry on CampToCamp.org
- Entry on UkClimbing.com
- Entry on Die Viertausender der Alpen
- Video: Traverse of Aiguille de Bionnassay to Mont Blanc with views of the sharp east ridge.
- Video: Extreme ski-descent of N face of Aiguille de Bionnassay.