The Niagara was a 245-foot (75 m) long sidewheel palace steamer launched in 1846. Like the others of its kind, it carried passengers and cargo around the North American Great Lakes. It was owned by the Collingwood Line. It was reported at the time that the fire was caused by an incendiary. The Captain insisted the fire could not have started in the engine room, because it was fireproof, and blamed combustible cargo stored below. It appears that the cause of the fire was never definitively established.