Shots of La Trenche dam on Saint-Maurice River. LAS of man turning wheel controlling water flow. Shots of genarators, of steel pylon towers at dam site. Shot of cut section of bush where new hydro line will be built. PAN along fast flowing river to junction of two rivers, future dam site at Peribonka, Quebec. Several shots of Chute-au-Diable dam under construction showing workmen, skeleton of structure.