I cooled down significantly by the day after the private causeway. The truth is, most of the people in this area were very respectful of paddlers. Many fences were just a single electric wire, high enough on one side to underpass without ducking.
Other farmers had solved the problem of crossing the river by piling up boulders for equipment to roll over. They put up signs saying "CROSSING" on either side to warn of this kind of structure. I am not sure a sign is really necessary, but it shows they were thinking of me, and helped explain the mystery that I had thought of as man-made weirs. The purpose is not in stopping the water, but in crossing it.
I don't mind these kinds of crossings. They are usually fun to paddle over, or at least easy to push the canoe through, and I imagine the fish have a better time navigating them, too.
And the river after Round Lake is often beautiful, well-treed, well-moosed. The water is clearer and there are frequent shale banks to stop on.
While happy in these thoughts I came across one of the worst fences I had seen. Three barbed wires straight across with frequent posts. I was fortunate to be just able to squeeze the canoe under on the side, while ducking through the fence on shore.
Maybe it is a good river, worth saving in places, and where else but the section after Round Lake? It's too bad that just a couple inconsiderate people can ruin so much of the river.
Day 58 ended: 50*31.395N, 101*55.356W