The stretch of the TransCanada had been closed due to water over the road. In Manitoba, 33 municipalities remain under states of local emergency, as well as 37 communities In Saskatchewan.
The improved forecast provided some good news for residents in more than 60 communities in the two provinces contending with flood waters this week.
Scott Wilson lives in Virden, Man., where people spent Monday sandbagging, trying to save homes.
"It's crazy," he said. "It's amazing how many people are just helping, but it's so disheartening when you just see it rising and rising."
Citing fear about homes in Winnipeg, the province said Monday it would activate the Red River Floodway on Tuesday morning.
In Saskatchwan, the TransCanada Highway closure stopped one Saskatchewan Roughrider fan from making it to Monday's game.
Steve Laschuk said he had to take refuge at a motel near Wolseley, Sask.
"It was quite alarming because when we were travelling back from Winnipeg, the whole way until we hit Wolseley, was just torrential downpour," he said.
He said the motel was evacuated for fear of flooding.
Laschuk and the other motel guests were taken to the town hall, but he said a family took him and his wife in for the night.
"Luckily, put up with a kind family," he said. "A bit of an adventure for a simple weekend away."
Laschuk said townspeople really pulled together to help those who were stranded in the community.
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