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It rises as the Red Rock River in the Centennial Mountains near the continental divide in southwestern Beaverhead County, near the border with Idaho, and flows west through Upper and Lower Red Rock lakes, then NNW past Lima to the Clark Canyon Reservoir , where it becomes the Beaverhead. As the Beaverhead, it flows NNE past Dillon. Near Twin Bridges, it joined by the Ruby River and the Big Hole River, and continues as the Jefferson River north and east. Near Cardwell, it receives the Boulder RiverThe Boulder River is a tributary of the Jefferson River, approximately 71 mi (114 km) long, in southwestern Montana in the United States. It rises in the Rocky Mountains at the continental divide in the Deerlodge National Forest in western Jefferson Count, and flows east to form the Missouri with the Madison and Gallatin northeast of Three Forks, approximately 28 mi (45 km) WNW of BozemanBozeman is a city located in Gallatin County, Montana. As of the 2000 census, the city had a total population of 27,509. It is the county seat of Gallatin County 6. Geography Bozeman is located at 45°40'40" North, 111°2'50" West (45. 677890, -111. Accordi.