It appears that the Eastern Townships of Quebec has a number of classic covered bridges, possibly due to its proximity to New England. I found the following site while trying to find driving tour information for the Eastern Townships. It explains the location and history of the bridges, along with containing pictures.
http://townshipsheritage.com/attraction/covered-bridges-southern-eastern-townships (http://townshipsheritage.com/attraction/covered-bridges-southern-eastern-townships)
New Brunswick DOT provides a link on their site for Covered Bridges in that province.
http://www.gnb.ca/0113/coveredbridges/coveredbridges-e.asp
(click on the counties for links to photos and details)