Jay. There probably is some river bouldering potential at Smarts brook, but it might be hard to access without getting your feet wet. There is a deeper section of gorge just upstream from the ice bouldering. There are a few icy mixed routes which were a little intimidating with the conditions that day that get you well into the broken ankle zone of fall potential. If the river was deep enough I bet you could find some lines. Otherwise maybe you could prop a pad against some protruding river rocks.