Various shots of the Pothole Dam, a part of the multimillion Saint Mary and Milk River irrigation project funded by the Prairie Farm Rehabilitation Administration. Shot of slowly filling Pothole reservoir. PANs of earth filled dam. ELSs of construction work looking across partly finished Saint Mary's River dam. Shot of machinery visible in extreme distance. Shot of diversion tunnel, man standing besides showing scale of tunnel. Shot of prairie. Several shots of giant earthmoving machinery moving past camera. Shot of power shovel loading dump truck. Shots of sheep's foot rollers being pulled by tractors, tamping down fill. LSs of earthmoving equipment at work. Shot of dump truck dumping fill. Shots of sheep's foot rollers, graders, letourneau carry-alls. (30/06/1949)