The valley of this river forms the southeastern approach to Lewis Pass; the river is thus adjacent to State Highway 7.
[1] Land Information New Zealand lists the name of the river as "not official", i.e. the name is not confirmed by the New Zealand Geographic Board.
[2] It was named for the surveyor Henry Lewis, who discovered[a] the pass in 1860 alongside his colleague Christopher Maling.
Later in 1860, the river was named by Julius von Haast during his own expedition; von Haast became the brother-in-law of Lewis' daughter in 1866.
This article about a river in Canterbury, New Zealand is a stub.