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The Mad River is a river in upper Northern California. It flows for 95 miles (150 km) in a roughly northwest direction through Trinity County and then Humboldt County, draining a 497 square mile (1290 km²) watershed into the Pacific Ocean north of the college town of Arcata near Arcata-Eureka Airport in McKinleyville. The river's headwaters are in the Coast Range near South Kelsey Ridge.