This is sort of a meditation on the Connecticut River and its ecosystem, and the relationship of humans to the river over time, and the death of various ways of life in rural New England. It's odd - I just read a history of the river that only dealt with the part that runs through Connecticut, and now this book essentially only deals with the part of the river in Vermont and New Hampshire, with Conn playing practically no role at all. Tripp lingers on the headwaters, writing about the beaver ponds and small farms up near the Quebec border where the river begins.
A lot of this isn't really about the river, though, but rather about hydropower and anti-big government people and the way dams have screwed up and continue to screw up river systems. This leads Tripp to departures from the river, including sections about the Cree and their troubles with power companies up near Hudson's Bay, about a right wing zealot who murdered a bunch of people in New Hampshire in the 90s, about Howard Dean (a friend of Tripp) and his governorship of Vermont. There is also a lot about the whole project of bringing back salmon to the river system and whether it could possibly ever work.
I'm not sure what the point of it all is, besides that we have kind of wrecked the river and that sucks. I mean, I would love for all the dams to go away too, but I don't think there's much chance of that happening.