Search and rescue personnel were called out on Tuesday evening in Great Falls.
It happened at about 8:30 p.m.
Boaters put their boat in the water at Broadwater Bay, and the engine started, but then died as they were backing out.
The people on the boat safely made it to shore, but the boat floated away.
Search and rescue was called to retrieve the boat.
A SAR member told KRTV: "The river is moving super-fast right now so I wouldn’t recommend people testing their boats right now on the river."
He added that people should make sure their boats are in good working order before launching into the river.
There were no injuries reported.
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