Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Imnaha River, with a gauge stage of ft at this location. This river is monitored from 0 different streamgauging stations along the Imnaha River, the highest being situated at an altitude of ft, the .

The Imnaha River is a tributary of the Snake River located in northeastern Oregon, stretching approximately 73 miles in length. The river has played a significant role in the history of the region, serving as a vital resource for Native American tribes, explorers, and early settlers. The Imnaha River flows through an arid landscape and is fed mainly by snowmelt and precipitation. The river is not dammed, but several reservoirs have been built in its drainage area to support irrigation and agriculture. The river offers various recreational activities, including fishing, rafting, camping, and hiking. The Imnaha River is home to several fish species, including salmon, steelhead, and trout, making it a popular destination for fishing enthusiasts.