It is the nearest location to Lemhi Pass over the Bitterroot Range, where the Lewis and Clark Expedition first crossed the Continental Divide in 1805. Sacagawea, the Shoshoni woman who guided the Expedition, was born near Tendoy. Lemhi Pass is a National Historic Landmark.
The site of Fort Lemhi is 2 miles north of Tendoy.
- U.S. Geological Survey Geographic Names Information System: Tendoy, Idaho
- Rees, John E. (1918). Idaho Chronology, Nomenclature, Bibliography. W.B. Conkey Company. p. 115.
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