I've done the pull off at the tunnel on up a couple of times. 2 years ago when I walked down through the scrub and dense brush below the tunnel to get to the water I heard stones clicking together. I stopped and listened and decided it had enough rhythm that it must just be the current moving 2 stones together. When I finally plopped into the river there stands Momma bear with 2 cubs! I'm all of 30 feet from her, the cubs start toward me, momma makes a gutteral sound and the cubs stop, turn 45 degrees and head straight out and up the hill away from me, then mom follows them. The whole time I was walking backward very slowly.
I turned, went right back to the truck, drove back down to the picnic area and put in there instead!
<(((>< In tribute to Ben, Duck Hunter extraordinaire, and man's best friend.