Do beaver Dams generate electricity?

Why do we build Dams? What different kinds of Dams are there? What makes the Hoover Dam one of the greatest engineering feats of all-time? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info .