Description
1.9 mi long; heads 22 mi NE of Joseph, trends ENE then E into Wallowa National Forest, to enter the valley through which Big Sheep Creek flows; Secs 19&18, T1N, R48E & Secs 13,24&23, T1N, R47E, Willamette Meridian
History
The name is of Umatilla origin and reportedly translates to “land ruled by a chief named Imna”.