The first recorded sighting of the river was on November 9, 1828, by Peter Skene Ogden of the Hudson's Bay Company, during his fifth expedition to the Snake Country. Odgen came southward along the Little Humboldt, encountering the main river at the confluence near Winnemucca. Ogden explored the river for several hundred miles, blazing a trail along it and making the first known map of the region. He initially named the river "Unknown River", due to the source and course of the river still unknown to him, and later "Paul's River", after one of his trappers who died on the expedition and was buried on the river bank. He later changed it again to "Mary's River," named after the Native American wife of one of his trappers, which later somehow became "St. Mary's River". However, in 1829 he suggested that "Swampy River" best described the course he had traversed. In 1833 the Bonneville–Walker fur party explored the river, naming it "Barren River". Washington Irving's 1837 book describing the Bonneville expedition called it "Ogden's River", the name used by many early travelers. By the early 1840s, the trail along the river was being used by settlers going west to California. The river provided drinkable water to earlier travelers on foot, but later emigrants using wagons required the significant riparian vegetation along its length as forage for their draft animals.
