What combination of factors (both natural and man-made) is necessary for healthy river restoration and how does this enhance the sustainability of natural and human communities? Objective Why were the dams put in place? What effects are the dams having on the anadromous fish populations and the surrounding environment? Why are the dams coming down? Background What combination of factors (both natural and man-made) is necessary for healthy river restoration and how does this enhance the sustainability of natural and human communities? Background This lesson focuses on the impacts that the build Duration: 90 Minutes.