Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Yaak River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Yaak River, the highest being situated at an altitude of ft, the .

The Yaak River is a tributary of the Kootenai River, located in the far northwest of Montana, USA. The river is approximately 83 miles long, with a drainage area of around 565 square miles. The Yaak River is known for its pristine water quality and diverse aquatic ecosystems. There are no dams on the main stem of the river, but there are several small impoundments used for irrigation and livestock watering in the upper reaches. The Yaak River is a popular destination for fishing, swimming, and boating. The area is also used for timber production and cattle grazing. The Yaak River has a rich history, with evidence of human habitation dating back over 10,000 years. The river was an important trade route for Native Americans and later used for logging and mining. Today, efforts are underway to protect and preserve the river and its surrounding ecosystem.