The Wallowa River is a tributary of the Grande Ronde River, approximately 55 miles (89 km) long, in northeastern Oregon in the United States. It drains a valley on the Columbia Plateau in the northeast corner of the state north of Wallowa Mountains.The river begins at the confluence of its east and west forks, which rise in southern Wallowa County, in the Eagle Cap Wilderness of the Wallowa–Whitman National Forest. It flows generally northwest through the Wallowa Valley, past the communities of Joseph, Enterprise, and Wallowa. It receives the Minam River from the left at the hamlet of Minam. Continuing north another 10 miles (16 km), it joins the Grande Ronde along the Wallowa–Union county line about 10 miles (16 km) north-northeast of Elgin and about 81 miles (130 km) from the larger river's confluence with the Snake River.The Wallowa Valley was home to Chief Joseph's band of the Nez Perce Tribe. Chief Joseph asked the first white settlers to leave when they arrived in 1871. The U.S. government expelled the tribe in 1877, when non-Indian farmers and ranchers wanted to settle the fertile Wallowa valley.
Length (km)
88513.920000
Maximum discharge (m³/s)
131.390168
Minimum discharge (m³/s)
2.520199
Mouth elevation (µ)
705.916800
Source elevation (µ)
1371.295200
Watershed (km2)
2460488704.819200
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