From the Niagara Falls Review:
Whirlpool Jet Boat Tours launched five jet boats into the Niagara River Tuesday to get prepared for the summer season of taking people into the river rapids.
The vessels were lowered into the river at Whirlpool Jet Boat Tours’ Queenston dock by crane because they are too large to be lowered in at Whirlpool’s Niagara-on-the-Lake location.
The boats, which went in early this year because of the warm weather, are taken out every winter for maintenance.