| North Fork Wenaha River | |
| Name Etymology: | Perhaps from a Cayuse language placename[1] |
| Map Size: | 300 |
| Pushpin Map: | USA Oregon |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of the North Fork Wenaha River in Oregon |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Washington, Oregon |
| Subdivision Type4: | County |
| Subdivision Name4: | Columbia, Wallowa |
| Length: | 16miles |
| Source1: | Blue Mountains |
| Source1 Location: | Wenaha - Tucannon Wilderness, Columbia County, Washington |
| Source1 Coordinates: | 46.0439°N -117.9108°W[2] |
| Source1 Elevation: | 5885feet[3] |
| Mouth: | Wenaha River |
| Mouth Location: | Wenaha Forks, Wallowa County, Oregon |
| Mouth Coordinates: | 45.9506°N -117.7947°W |
| Mouth Elevation: | 2808feet |
The North Fork Wenaha River is a tributary, 16miles long, of the Wenaha River in the U.S. states of Washington and Oregon.[4] The river begins in the Blue Mountains in Columbia County, Washington, and flows generally southeast through the Wenaha - Tucannon Wilderness to meet the South Fork Wenaha River in Wallowa County, Oregon. The combined forks form the main stem Wenaha, a tributary of the Grande Ronde River.[5]
The river has only one named tributary, Deep Saddle Creek, which enters from the right slightly upstream of the Washington–Oregon border. The South Fork Wenaha River also enters from the right.[5]
Chinook salmon and steelhead spawn in the North Fork, and the wilderness near the river provides habitat for diverse species. These include bighorn sheep, elk, bald eagles, cougars, American black bears, among others.[4]