Well done Mac. - Bill Freeland. Bonne et Heureuse Annee

Because of the date, there are four possibilities. It is not the Richelieu since that ship did not have continuous exterior promenade decks. Because of the type of lifeboat davits it is not the St.Lawrence. Therefore it is either the Quebec or Tadoussac -sister ships. If the date were more precise it might be possible to determine which one of these sisters.

Could also be the RICHELIEU, pictured under the "scrapyard" name of PASSENGER 3 at http://www.shipspotting.com/gallery/photo.php?lid=1992629#

Judging by the geographic background I'm guessing Lac St Pierre between Montreal and Trois Rivieres. For sure its one of the old CSL river steamers mentionned above

Bonjour Claude:in 1948/49, the locks above Montréal were only 260 feet long and this vessel must have been 350 some feet or about. More likely the Saint Laurent river.

Might be QUEBEC:
http://www.shipspotting.com/gallery/photo.php?lid=66828

https://www.cslships.com/en/our-company/over-100-years-shipping-history

or this one:

http://www.shipspotting.com/gallery/photo.php?lid=1910969

or St. Lawrence:

https://picclick.com/Canada-Steamship-Lines-Cruise-Ship-ST-LAWRENCE-Tadoussac-Saguenay-193770311821.html#&gid=1&pid=1