From the source of its East Fork to its mouth at the Yakima , it flows about 13 miles ( 21 km ) , passing through Kennewick and Richland .
Amon Creek is the largest tributary of the Lower Yakima River in Benton County , Washington .
From the source of its East Fork to its mouth at the Lower Yakima River , it flows about 13 miles ( 21 km ) , passing through Kennewick and Richland .
Amon Creek is the largest tributary of the Lower Yakima River in Benton County , Washington .