The East Gallatin River is a tributary of the Gallatin River in southwestern Montana in the United States. It rises near Mount Blackmore in the Gallatin Range in Gallatin County, and flows northwest, joining the Gallatin from the east above Three Forks. The Gallatin River The Gallatin River is a tributary of the Missouri River, approximately 120 mi (193 km long), in the U.S. states of Wyoming and Montana. ... State nickname: Treasure State Official languages English Capital Helena Largest city Billings Governor Brian Schweitzer (D) Senators Max Baucus (D) Conrad Burns (R) Area - Total - % water Ranked 4th 381,156 km² 1 Population - Total (2000) - Density Ranked 44th 902,195 2. ... Mount Blackmore is a mountain in southwest Montana, United States. ... Gallatin County is a county located in the state of Montana. ... Three Forks is a city located in Gallatin County, Montana. ...
Because the West Gallatin is substantially larger, it's generally recognized as the mainstem river.
The EastGallatinRiver, a major tributary of the Gallatin, is also floatable for about 20 miles from Bozeman to its confluence with the mainstem near Manhattan.
On the lower river (measured at Gallatin Gateway), 500 cfs is a minimum flow and 2,500 cfs is a maximum flow.