page_title: Mad River (California)
hierarchical_section_title: Mad River (California)
caption_attribution_description: English: Map showing the Mad River in NW California, USA. Shaded relief from US Geological Survey.
context_page_description: The Mad River is a river in upper Northern California. It flows for 113 miles in a roughly northwest direction through Trinity County and then Humboldt County, draining a 497-square-mile watershed into the Pacific Ocean north of the town of Arcata near Arcata-Eureka Airport in McKinleyville. The river's headwaters are in the Coast Range near South Kelsey Ridge.
context_section_description: The Mad River is a river in upper Northern California. It flows for 113 miles (182 km) in a roughly northwest direction through Trinity County and then Humboldt County, draining a 497-square-mile (1,290 km²) watershed into the Pacific Ocean north of the town of Arcata near Arcata-Eureka Airport in McKinleyville. The river's headwaters are in the Coast Range near South Kelsey Ridge.
caption: Map of the Mad River watershed
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