The province has diverted a portion of the Assiniboine River via the Portage Diversion to reduce the risk of basement flooding and damage to farmland.
Heavy rains have swollen the Assiniboine, the province said in a statement.
The biggest risk would be if there was a severe thunderstorm, the province said.
As of Friday morning, 8,000 cfs is being maintained on the Assiniboine River downstream of Portage la Prairie and 4,000 cfs is being diverted into the Portage Diversion.
A flow of 8,000 cfs will be maintained on the river over the long weekend and Portage Diversion operations will be reassessed early next week.