The Jacques-Cartier Bridge will be closed in both directions from 4:45 a.m. until 11:00 a.m., so motorists are advised to take the Victoria or Champlain Bridges instead.
The marathon and half marathon will start on the Jacques-Cartier Bridge at 8:30 a.m.
At the finish line in Lafontaine Park, singer Marjo will be presenting the closing concert, starting at 12:30 p.m.
All roads are expected to be reopened by 4:00 p.m.
Click here for a detailed map and street closures.
For information on changes to bus service, click here.