The Bitterroot River is a tributary of the Clark Fork River in southwestern Montana
, USA. It runs for about 75 miles (121 km) south-to-north through the Bitterroot Valley
, from the confluence of its West and East forks near Conner to the Clark Fork near Missoula
and Missoula County
along with the towns along the Bitterroot River, including Hamilton
and Missoula, are popular destinations for fly fishing, with rainbow trout being fairly prevalent and with smaller populations of brown trout and cutthroat trout.The Bitterroot is a Class I river from the confluence of the East and West forks to its confluence with the Clark Fork River for public access for recreational purposes.