It flows north-northwest for approximately  until it reaches Rubicon Reservoir. The river then travels northwest and within  of the Rubicon Reservoir is met by Highland Creek, Miller Creek, and the Little Rubicon River.
As the river flows north-northwest towards Rubicon Reservoir, which is approximately that far away, it eventually reaches there. From there, it travels northwest, where within a short distance, Highland Creek, Miller Creek, and the Little Rubicon River converge with it near Rubicon Reservoir.