The Grande Ronde River is a tributary of the Snake River, approximately 180 mi (290 km) long, in northeastern Oregon and southeastern Washington in the United States. It drains an area on the east side of the Blue Mountains on the Columbia Plateau, flowing through the agricultural Grande Ronde Valley in its middle course and through a series of scenic canyons in its lower course.

It rises in the Blue Mountains in the Wallowa-Whitman National Forest in southwestern Union County approximately 20 mi (32 km) south of La Grande. It flows generally north along the east side of the Blue Mountains, then east, past La Grande, then generally northeast through the Grande Ronde Valley in a meandering course between the Blue Mountains and the Wallowa Mountains, receiving Catherine Creek east of La Grande.

Approximately 10 mi (16 km) northwest of Minam it receives the Wallowa River from the southeast, then receives the Wenaha River at Troy just south of the Washington border. It crosses into southeastern Washington, traversing the extreme southeast corner of the state and entering the Snake from the east approximately 5 mi (8 km) north of the Oregon border and 15 mi (24 km) downstream from the mouth of the Salmon River. (Source: Wikipedia)

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