MLS of bridges at Cote Sainte-Catherine and at Saint-Lambert locks. Shot aboard freighter of sides of Snell Lock, closed gates in background. Shot of ships deep in Snell Lock, including the "Catherine Sartori". HASs of freighter "Trans Quebec" in Saint-Lambert Lock. Shot of Saint-Lambert control booth, lift bridge rising in background. CUs of large vertical windlass, rope wrapped around it, men at work, of hull of ship close to camera. Shot of bow and hull of laker "Capt CD Secord" in lock, snow falling. HASs of ships deep in lock, entering gate, of stern of ship and water pouring into lock.