The Cass River is an alpine river in the Canterbury region of the South Island of New Zealand. It rises in the Hall Range immediately below Rankin Pass, and also receives water from the nearby Huxley Glacier on Mount Hutton.New Zealand 1:50000 Topographic Map Series sheet BX16 Mount Elie de Beaumont After dropping very rapidly the river flows south with braided channels along a flat-bottomed valley for . The Leibig Range and Gamack Range are to the west, and the Haszard Range to the east.Wises New Zealand Guide, 7th Edition, 1979 The river flows into the west side of Lake Tekapo where it has built up a gravel delta.New Zealand 1:50000 Topographic Map Series sheet BY17 Lake Tekapo
The Cass River is named for Thomas Cass, Chief Surveyor of Canterbury Province from 1851 to 1867.
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