Mowers started his hockey career with the Niagara Falls of the OHA Senior A League.

He had an excellent amateur career before playing with the Detroit Pontiacs of the MOHL and the Omaha Knights of the American Hockey Association.

His 1.93 goals against average with the Omaha Knights inspired Jack Adams to sign Mowers for the 1941 season with the Detroit Red Wings.

Next season, Mowers goals against average increased as the Detroit Red Wings plummeted to 5th place.

He regained his skills in the playoffs leading the Red Wings all the way to the Stanley Cup Finals against the Toronto Maple Leafs.