One branch of this river 
One branch of this river mingles with the Sweetwater in Pathfinder Reservoir. Another tributary originates in the Mosquito Range and flows through Greeley and Sterling, while another goes  through Goshen Hole and (*) Casper. Ultimately joining the Missouri, it also receives the Loup and the Elkhorn. For 10 points— name this river with North and South portions, which flows through Grand Island, Denver, and Omaha.
One branch of this river mingles with the Sweetwater in Pathfinder Reservoir.
Platte River