Manitoba Highways has closed Highway 30 south of Gretna at the U.S. border because of water flooding over the road.
The North Dakota state Transportation Department says state Highway 18 is closed at Neche due to water on the roadway.
Neche is just across the border from Gretna.
U.S. Customs and Border Protection is advising that all commercial and passenger vehicle traffic travelling through the the Gretna port of entry will be required to use an alternate route.
Associated Press has reported that heavy rains have led to flooding in parts of North Dakota that has forced some people from their homes.
In Pembina County, the 1,300 people in Cavalier have been evacuated as officials work to shore up the Renwick Dam on the Tongue River to the west of the city, AP reported. Some of the 160 people in Crystal have voluntarily left their homes due to floodwaters moving overland through the town.
In Walsh County, officials in Grafton have shored up an emergency levee as the Park River nears a record crest there. About 4,500 people live in the city.