Years ago, I watched them climb vertical concrete wall at the Bonneville Dam. As long as there was a film of water running down the concrete, they could climb it. It was strange to watch. They would just hang there vertically, then wiggle like hell up an inch or two and then hang again.
I had heard that they were edible, so I caught a couple by putting my sock on my hand and then bashing their head against a rock.
Cleaned them (only killed two) and fried hot dog lengths in a frying pan on a Coleman camp stove. Taste was good, but quite oily. It was one of those, "OK, done that." kind of things. They were commonly used as sturgeon bait back then.