- Swisstopo - 42 - Oberwallis
- Swisstopo - 274 - Visp
- Swisstopo - 1289 - Brig
Alpe Veglia (hotels) - Rossetto (1h30; branching to the Furggubäumlicke / Forca d'Aurona) - point at the vertical of the Simplon tunnel (0h15) - start of glacier (0h15) - glacier firn (0h40) - rock gully (0h20) - Farello bivouac - Chaltwasserpass / Bocchetta d'Aurona - Chaltwassersee - Chaltwassertäli - Chalte Wasser - Simplon Hospiz (2h; Post Auto stop) // Total time: 5h
The red-white route markings end a the start of the Aurona glacier. From here climb over firn on the right hand side of the valley to a rocky outcrop. Cross a bergschrund between a small waterfall and the wall of the Wasenhorn / Punta Terrrarosa. Now keep level until you see at the vertical a red-white marking on the rocks above you. Walk there over the steep firn. Next to the marking you'll find chains and metal steps, which lead towards the left to a gully. More chains and metal steps will bring you through the gully, at the pass. Turn right below a small peak to arrive just below the Farello bivouac. Stepping East on a rocky balcony you will see the valley at your feet from where you came.
When traveling from Simplon to Alpe Veglia you need to find the red Farello bivouac in order to locate next to it the gully entry. From South the bivouac is hidden by a small peak, but it is visible from the Northern edge of the pass.
From Alpe Veglia to Simplon the route over the glacier and through the gully is not obvious. The Aurona glacier is currently flanked by steep rock faces and divided by two horizontal rock outcrops. It is important not to cross the second horizontal rock range, but to locate the red-white marking at its left hand extremity, where the trail to the gully starts.
A winter route is farther left from the summer gully route when looking up the glacier. See 25 March 2013, Traversée Simplon >> Realp - J2 : Monte Leone Hütte >> Alpe Dèvero
The difficulty of the Chaltwasserpass / Bocchetta d'Aurona varies highly with conditions. On soft summer firn the glacier can be crossed with ordinary Alpine boots, but if the snow is hard, crampons and and ice axe are necessary to climb the steep slope. A helmet is also advisable, for the gully is prone to rock falls. In case snow covers the gully, crossing the pass may necessitates rope and climbing gear or, during good conditions, skis.
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