Overview-ApproachTo arrive to the mountain hut of Biadós you must to consult the great description of the Bachimala's page to go to Plan and Biadós (Bachimala).
Note: from Viadós exist two routes, this is longest but easiest. The other shortest route goes across the west face and the ridge N-NW of Posets. This route is only advisable if you spend the night in Refuge Angel Orús after the summit.
Route DescriptionThe third trailhead (Viadós) and less travelled (because it's long) of Posets with a pretty view of little lakes.
From mountain hut of Viadós (1745m) we'll take a route near of the river to the Barranco de la Rivereta. It's a soft itinerary initially. In the Punta de Leners we'll follow for the right side and we'll see the Ibons or little lakes (Millares and Leners) to the right. We'll continue to the Col de Eriste (2890m) and we'll turn to the left side towards the Ibón de Llardaneta that is bordered by the left side. Finally we'll arrive to the signal of bifurcation that bring to Posets (left) and mountain hut of Angel Orús or Forcaus (right). From this point is the same route like Eriste-Forcaus across the Canal Fonda. Generally: 6h to the summit from Biadós.