Various shots of loggers on logs, moving wood with their pike poles. LS of logger running across logs. CUs of pike poles biting into wood, of logs being rolled in water, of lumberjack's feet birling logs. MLS of logger setting explosive charge and running to river bank. MSs of small, rough river, logs moving down rapidly, logs stacked on river banks. MLSs of dam and sluice gate, logs going through as men push them on with pike poles. Shot of lumberjacks rolling large logs off river banks into water. General PANs of river jam-packed with logs, of men on logs. MSs of logs and pieces of ice moving slowly across frame. Sequence showing "alligator" at work, being winched off slip into water, cruising on river away and past camera. BOATING SHOT of logs and ice from bow of "alligator". Shot of sole crewman of "alligator" from bow of boat. HAS of "alligator" pulling log jam apart.