Imnaha River
The Imnaha River is a 73.3-mile-long (118.0 km) tributary of the Snake River in the U.S. state of Oregon. Flowing generally east near the headwaters and then north through Wallowa County, the entire river is designated Wild and Scenic. It follows a geologic fault to the Snake River, and in addition to land in the Wallowa–Whitman National Forest and private land, its corridor includes parts of three special management areas: the Eagle Cap Wilderness, Hells Canyon National Recreation Area, and Hells Canyon Scenic Byway. The Imnaha flows by the unincorporated community of Imnaha, the only settlement along its course, and enters the Snake River roughly 4 miles (6 km) from the larger river's confluence with the Salmon River of Idaho and 192 miles (309 km) from its confluence with the Columbia River.
| Imnaha River | |
|---|---|
Imnaha River near Imnaha | |
Location of the mouth of the Imnaha River in Oregon | |
| Etymology | The land ruled over by Imna, a native American leader Alternatively, the name of a Nez Perce village. |
| Location | |
| Country | United States |
| State | Oregon |
| County | Wallowa |
| Physical characteristics | |
| Source | Confluence of the North and South forks of the Imnaha River |
| • location | Wallowa–Whitman National Forest, Wallowa County, Oregon |
| • coordinates | 45°06′47″N 117°07′31″W |
| • elevation | 5,324 ft (1,623 m) |
| Mouth | Snake River |
• location | Hells Canyon National Recreation Area, Wallowa County, Oregon |
• coordinates | 45°49′03″N 116°45′53″W |
• elevation | 945 ft (288 m) |
| Length | 73 mi (117 km) |
| Basin size | 855 sq mi (2,210 km2) |
| Discharge | |
| • location | Imnaha, 19.3 miles (31.1 km) from the mouth |
| • average | 511 cu ft/s (14.5 m3/s) |
| • minimum | 16 cu ft/s (0.45 m3/s) |
| • maximum | 20,200 cu ft/s (570 m3/s) |
National Wild and Scenic River | |
| Type | Wild, Scenic, Recreational |
| Designated | October 28, 1988 |