The Centennial Library officially opened on May 27, 1967 to coincide with the arrival of the Centennial Voyageurs Canoe Pageant. Dignitaries included Senator Harry Hays, Premier E. C. Manning, Her Royal Highness Princess Alexandra of Kent, and Mayor Marcel D’Amour of Hull, Quebec.
The seven-storey library ultimately cost around $4,000,000. The public and staff were impressed at the size; three floors just for the public, including an auditorium, children’s library, and meeting spaces in the basement. It was rededicated the Stanley Milner Library in 1996.