The Pahsimeroi River is a 58.7-mile-long (94.5 km)^[4] river in Idaho in the United States. It is a tributary of the Salmon River, which in turn is a tributary to the Snake River and Columbia River.

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Pahsimeroi River
Location of the mouth of the Pahsimeroi River in Idaho Show map of Idaho Pahsimeroi River (the United States) Show map of the United States
Location
Country	United States
State	Idaho
Counties	Lemhi, Custer
Physical characteristics
Source
• coordinates	44°4′22″N 113°40′14″W[1]
• elevation	7,745 ft (2,361 m)[2]
Mouth	Salmon River
• coordinates	44°41′31″N 114°2′55″W[1]
• elevation	4,640 ft (1,410 m)[2]
Length	59 mi (95 km)
Basin size	827 sq mi (2,140 km2)[3]
Discharge
• location	at mouth[3]
• average	230 cu ft/s (6.5 m3/s)[3]
• minimum	87 cu ft/s (2.5 m3/s)
• maximum	710 cu ft/s (20 m3/s)

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From its source in Custer County, at the confluence of the West Fork and East Fork headwaters, the Pahsimeroi River flows generally northwest, through the Pahsimeroi Valley, between the Lemhi Range to the east, and the Lost River Range and to the west.

The Pahsimeroi River joins the Salmon River near Ellis, Idaho, upriver from Salmon, Idaho.

The water of the Pahsimeroi River and its tributaries is used for irrigation agriculture. All of the river's mainstem tributaries are wholly diverted and totally disconnected year round due to diversion for irrigation.^[5]

• List of rivers in Idaho
• List of longest streams of Idaho