The Noyo River is a river on the north coast of California in Mendocino County. The river's headwaters are in the steep Mendocino Range, but downstream the river flows through gently sloping marine terraces before draining into the Pacific Ocean. The 113 square mile-watershed extends east to the small city of Willits and the river's mouth is in Fort Bragg, which uses the river for drinking water. The average rainfall is between 40 and 65 inches per year.