I had one bear come out 20 feet behind me at prison (near the top end) on November 3rd this year. The disturbing thing is that when I looked at him and yelled at him, he popped his jaws and rocked his head a few times. I eventually got him to wander off with more yelling and swinging of my rod, nearly to the point where I was hitting him with my rod with how close he got. He didn't run, but rather slowly walked away. Hopefully someone hasn't been feeding him with the aggressive behavior he showed to me.
The other 4 bears I ran into in the upper this year took off as soon as they saw me.
I agree with Dave though. A cougar in the lower is a problem. Too many people using that area. The ones I've seen were all in the upper and only posed a problem to fisherman, not families with small children.