Officials are warning that water levels on the South Saskatchewan River should rise by one metre this weekend thanks to heavy rains in Alberta.
"The South Saskatchewan River is currently flowing close to 500 cubic metres per second," said Assistant Fire Chief Bill Coffin.
"By this weekend, the flow is expected to increase to between 800 and 900 cubic metres per second."
This is making the river more dangerous than usual, with strong currents, a shifting riverbed and slippery banks making it treacherous.
The province's Water Security Agency is predicting that the South Saskatchewan should continue to rise through all of next week.
Officials said they don't know if the higher levels will lead to flood, but the agency is releasing more water out of Lake Diefenbaker.
The flow out of the lake is not expected to cause flooding.