This navigation restriction on the Ottawa River is near communities such as Wendover, Plaisance, Papineauville, L’Orignal and Calumet (Quebec), near Hawkesbury.

Here are the specifics from Transport Canada:  

https://www.canada.ca/en/transport-canada/news/2019/05/minister-garneau-announces-the-lifting-of-additional-restrictions-to-navigation-related-to-flooding.html