Construction of the giant hydropower dam near Massena in the 1950s forever tamed the once wild St. Lawrence River. It allowed engineers to harness the river’s natural ebb and flow for energy production and to protect homes and ports at the same time. But in the process, it hurt the indigenous plants and animals that depend on those highs and lows to survive. The environmental group Save The River has been leading a charge to persuade the agency that controls water levels to return more natural ebbs and flows to the St. Lawrence. One way is by giving the younger generation of River residents a hands-on lesson.