The Upper Ottawa Valley League had been operating successfully since 1898. It was therefore inevitable that a junior league would be started when junior hockey started up in the Ottawa District in the late 1920's. The junior league actually started up in 1929-30 with the three core cities - Pembroke, Arnprior, & Renfrew. It continued through the 1936-37 season with these teams - except for 1932-33 when Arnprior did not have a team. It was a Junior A league in 1945-46 and then did not operate until 1947-48 when it was Junior B. It then continued as Junior B.