The water of the Lemhi River and its tributaries is used for irrigation agriculture.

Of the river's mainstem tributaries, only 7% are not totally disconnected year round due to diversion for irrigation.

There, the group encountered a tribe of Shoshone Indians, one of whom turned out to be Cameahwait, brother of Sacagawea.

The expedition sent a reconnaissance party, guided by Swooping Eagle,[6] north along the Lemhi to the Salmon River attempting to find a navigable path, but turned back when they found that the Salmon was not passable by boat or on land.

[6][7] Media related to Lemhi River at Wikimedia Commons