I noticed at this low water level that there are the remnants of a crude stone work at a spot where the river powered through and cut a channel at some time in the past. In fact, there was stone works on both the upstream and downstream ends of the cut and what may have been some rip-rap in mid channel by the top end...I unexpectedly hit my paddle on the rip-rap. In Seattle, the waterway earthworks were often enormous changes created with the use of steam shovels and explosives. Here in the Northeast, many of the earthworks that I run across were powered by some guy with a shovel, ox or mule and a wagon. I often find submerged rock beds near bridges, which I read as former fords from before the bridges were built or in some cases, remains of an earlier generation bridge.