No guesses? Well this trail was one of 2 or 3 major trails that crossed the district prior to roads being built. Because this trail got bypassed by roads early in FS history, there are 12' dia. trees growing in the tread in places. Also parts of this trail can now be seen on Google Earth, because of the higher resolution of their images.
Don
Is it on the Fish Creek divide?
Not along the Fish Creek Divide, this trail transects the district from East-West not North-South.
Don
Are you at the edge of a clear cut and where the trail takes a jog down to the road?
D 2
That tree stand is about halfway between where your thinking and the trail junction to Salmon Lake. So you are corecto mundo or correct in your assumption that this is the Plaza-Clackamas Lake Trail. The new Google images shows this trail in the rockslide west of the Cougar Creek Trail near the top of the ridge above the Abbott Road.
Your turn there big D to post one.