Shot of wall map indicating emplacement of Pine Portage Dam and Tunnel Dam, renamed George W Rayner Dam and Des Joachims Dam. Unsteady brief AERIAL SHOT of the GW Rayner Dam on Mississagi River under construction. Various ground shots of nearly finished dam. Shot of Robert Saunders, chairman of Ontario Hydro and Premier Leslie M Frost. Unidentified men with them at ceremonial opening of dam. AERIAL and ground shots of nearly finished Pine Portage Dam on Nipigon River. LASs of dam, two mounties and Indigenous man in ceremonial dress visible in foreground. Shot of Saunders and Frost at official opening of dam. AERIAL and ground shots of Des Joachims Dam on Ottawa River. Sequence on George Drew, former premier of Ontario and Leader of Conservative Party in Ottawa, visiting site with other men. Shots of large crowds of people at official opening of Des Joachims Dam, Robert Saunders and Leslie M Frost speaking, officially opening generating station. Three-shot of Frost, Drew and Saunders. Shot of sign: "Ontario Hydro - More power for all Ontario". (30/06/1950)