hmm you are rite.. our guide took us to right ban of river as we leave jeeps at GATAL... the trek at start was very beautifull but we find many flat faces and we had to climb the up to avoid these flat faces... then at the point u are mentioning the single tree. we get locked on a steep mountain and.. it was very dangerous to cross that place.. it tooks about 1.5 hours for our team to cross that point..from onwards the trek was same as yours.... on return we again used some different route..... taking that steep glacier as big threat and no info about that double tree bridge we decided to move on the other side of river. we then had to climb a huge mountain which took us to a very lush green and forested valley.. we then saw a very beautifull water fall coming from spinkhor lake.. after that all the trek wa very easy and very beautifull