Imnaha Rapids is a stretch of rapids in Idaho County, Idaho, in the Blue Mountains region. It lies about 31.8 miles west of Grangeville and roughly 115.7 miles east of Pasco as the crow flies.
The Blue Mountains of northeastern Oregon and adjacent states are a group of dissected uplands and volcanic plateaus with ponderosa pine, Douglas fir and grand fir forest and dry grassland on lower slopes. Deep canyons and steep tributaries carry snowmelt streams with waterfalls.
Idaho County holds 65 recorded rapids, and several are close by. Bear Creek Rapids, is about 1.2 miles away. Divide Creek Rapids, is about 1.4 miles away. Mountain Sheep Rapids, is about 1.7 miles away.
Imnaha Rapids is located at 45.8181° N, 116.7655° W. The listing is based on the USGS Geographic Names Information System, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this rapid yet.