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Very boggy on many sections on way to the bealach under Beinn Dubhchrag, but there are always somehow to get around the wettest spot.
There is a new bridge after the first boggy section right after the bridge over the train tracks, it is a bit funny with such a nice bridge as there are nothing but boggy paths on each side of it.
There are two pathes from the bridge that forks shortly after leaving the bridge. The one up right is less boggy but more up and down and it starts the ascend immediately, the left one follows the river on left hand and is very boggy several times before the two paths join again after 10-15 minutes walk.
Very steep approach down to Bealach Buidhe, which you have to climb when returning - huh, remember to save energy for that one. There is a nice flat rock that I used as "bed" on the unnamed northern top of Ben Oss just next to the path - a good rest
Route:
Approx times from car park:
0:25 New fine bridge over Allt Glean Auchreoch
1:00 Stile, that is of no use
2:45 Beinn Dubhchraig (15 min break)
3:30 Bealach Buidhe
4:15 Ben Oss (25 min break)
5:20 Bealach Buidhe
5:40 Start of descend
6:40 Stile, that is of no use
7:35 Car park
I could do the walk one hour quicker on fresher legs, I think.