I posted a trip report from the Fish Creek Trailhead to Fish Creek Camp but it has not been approved yet. Unfortunately, I did not take the Aspen Grove Trail so I can only give insight from the intersection of the two trails to FC Camp.
From that intersection, there were a few downed trees. All but one was easy to get around. The “hard one” just took a little finesse but was doable.
Here is a link to a pic of that tree. It’s steeper than it looks (left to right) and a little slick on the downhill side. My son (in the picture) had no problems as long as he took it slow.