I have no idea what a "next generation" dam is. However, if the purpose is strictly flood control (i.e., no hydropower), then it could be built with minimal affect on the fish. It could be a 'dry dam' whereas the river runs thru a concrete dam without obstruction (i.e., no reservoir). If a major storm, with flood potential, is in the forecast, they can close the opening thru the dam with a flood gate, thereby creating a flood storage reservoir until the storm passes. All the water could then be released, slowly, and the river could resume it's normal course.

But this is not a new idea either. Lots of these dams in the Northeast.

The report sounds like an interesting concept. Thanks for the summary.