The descent over the Sperrbachtobel was steep, stony, and, due to the streams flowing down the wall side, sometimes a bit wetter than we had hoped. Places that were more difficult or more exposed are secured with steel cables. In the past, the ravine was also blocked in spring by considerable amounts of old snow and avalanches, which presumably led to its name. Several yards of descent over a short distance, which were quite strenuous, led us deep out of the gorge to the Sperrbach.

 At the first Sperrbach bridge, those interested in geology should take a closer look at the rock faces on the opposite side, as we did. Only rarely do you get to see the brown-black, slate, and partly blue-violet rock layers that make up the so-called Fleckmarl. Many Alps in the Allgäu mountains are located on this patch marl, which produces very fertile, loamy soil and thus flower-rich and lush alpine pastures. The view over the wild gorge in the direction of Muttler, a rocky peak above the ravine, was particularly impressive. Although June, we were still faced with small avalanche fields, which were leftover from the previous winter. It was difficult and steeped in history.

It was then necessary to descend several, densely overgrown and quite arduous hairpin bends, before crossing the so-called knee.

We reached the area where the Sperrbach flows into the Trettach and the path led to the left, which was steeper and rockier. We then reached the second Sperrbach bridge below the knee.

Towards the beginning of the valley, the path leads through mixed mountain forests further down and deeper and increasingly wild. We could take it easy, strolling past the hut where the material cable car of the Kemptner hut begins. 

As if welcoming visitors to the Allgäu Alps, the imposing peak of the Trettach towers into the sky. 

It was a very slow walk through fields of flowers and cows as we went down over the Alpe Oberau and towards Spielmannsau.