(Note: Rock/Boulder Creek "Blue river Campground" down to Columbine Landing at the bridge is still relatively clean)
There is now a deadly main-channel-wide strainer in the Upper Blue section ABOVE the usual put-in (Sliverthorne town down to the usual rafting put-in above blue river campground). A couple of the bridges near "the ponds" have low clearance, but are OK if people in a raft "duck". The last "concrete bridge" has the lowest clearance. After this, about 1-2 miles above the usual put-in for the "upper blue", the Right channel of current has a large pine tree across the whole current.
This is usually a family friendly class II-III float, but not right now. Smaller currents that braid out to the left in the willows, lead to a clear channel, but it was a pain to line the boat over to one of the micro-braids once we were 50 feet upstream of the strainer.