Yeaahhh, I gotcha now. Where I turned right on Lowell to head to 20, you'd have been coming from the left, if not for the river, which i think you're right that it's the Bear. The way I was talking about is from the other side, so you'd need to try over to the far right from where you took the pic. I assume you tried a little bit to the right from there where the gravel 'road' crosses? Last time I looked, which was a few weeks ago, that was too deep. If you go waaaaaaaay to the right, maybe even having to cut a short bit of new trail, that's where you can cross...barely. I saw a fellow in our group do it, but he didn't bother getting up (down from your side) to that overgrown logging road because not all of us in the group were willing to do it.
So, if you came from that direction, that means you went through the *other* riverbed area where you'd have been naughty to cross? If you head back out there, from your side, if you turn left and head down the riverbed a little bit, there's a horizontal mineshaft on the right side that's like a half mile long, it's pretty awesome. By the time you get to the bend, the light at the entrance is pin size. If you haven't already, check it out and bring a flashlight.