I walked this entire section this afternoon.
The construction, so far, is at the upper end of the special regulation section. It is extensive. As can be seen in Biggie' pic above, part of this is a reconstruction of the confluence of the Run and the main creek. Most of the work is upstream of the confluence.
I'll say that I am impressed with the work that I saw today (I am, generally, an advocate of stream habitat improvement projects). It is well done and in keeping with current best practices. Eroded banks have been closed with mudsills and rock vane defectors. Woody debris has been pinned in some places. It looks good.
There are shot rock piles downstream indicating additional work pending. The dam has been breached, but only a small section - about 6' - on the trail side of the stream and water levels are close to normal.
Be aware that the Run parking area is closed. Unfortunately, late last night, a fire gutted the old mill building apartment complex (this is the very old stone structure across the street from the Children's Lake dam). The stone section is intact but much of the roof is collapsed and the interior appears to be a total loss. Thankfully, there was no loss of life.
The lake itself is drawn down, but most of the lake bottom is, thankfully, still under water. In the past, draw downs that exposed the lake bottom resulted in severe sediment run-off into the Run.
Will keep you posted.