Gone to Flat rock many times for the natural water slide. Seen people take wicked spills on their heads,hips,elbows there. Ooch!
Water stays colder than most streams around. Liming in the upper parts of the stream have been going on for many years. Not sure of the success. Very scenic area. I have fished there a few times before the end of June. (caught only stockers)
Stream seems to get real low fairly often but there are some small holding pools.
Never saw much in the way of bugs there but haven't fished there for over 5 years ago.
Beam,90 Foot, and Wolf rocks are all close by Linn Run and offer nice views and cool hiking. Hit Flat rock when done and cool off.