Winnipeg police said alcohol was a contributing factor to a boat capsizing on the Red River late Friday night near Chief Peguis Trail.
The incident left one man missing and sent three others to hospital.
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Officials said four men were on board the boat when it flipped over around 11:15 p.m. Three of the men were able to swim to safety near Whellams Lane.
All three were taken to hospital. Two are currently in stable condition and one is in unstable condition.
The 16-foot aluminum boat has also not turned up.
Crews searched from the Chief Peguis Trail Bridge all the way north to Lockport, but found no trace of the man or the boat.
Police said the driver of the boat, a 24-year-old man, was found to be intoxicated. He has been arrested for drunk-driving related charges and was released on a promise to appear in court.
Investigators are hoping to speak with anyone who may have talked to the group of men at the docks at The Forks earlier Friday evening, or anyone who may have video footage of the boat on the water before the accident.
Investigators are continuing their investigation aided by the Missing Persons Unit. Anyone with information can call 204-986-6219 or Crime Stoppers at 204-786-8477.