From the Post this morning:
"When runoff from rain and snow sent sediment pouring into rivers and streams, the deluge also eliminated deep pools that formed natural trout habitat. That development spawned the "Trees for Trout" program in which workers have placed about 500 fallen trees in waterways to cut back erosion and create new pools."
I guess it's mostly smaller streams, thankfully, since we haven't seen Bailey or whatnot choked out.
Full article: The Denver Post - The restoration: Five years later