Mad River is a small community located in Humboldt County, California. It is situated along the scenic Mad River, which flows from the Trinity Alps into the Pacific Ocean. The region experiences a mild Mediterranean climate characterized by warm, dry summers and cool, wet winters. Summers typically see temperatures ranging from the low 60s to mid-70s Fahrenheit, while winters average in the 40s and can bring heavy rainfall.

The hydrology of Mad River is influenced by its proximity to the coast and the surrounding mountains. The river is fed by numerous tributaries, resulting in a diverse ecosystem that supports a variety of aquatic life. The watershed also provides water for agricultural activities in the region.

Outdoor recreation opportunities in Mad River are abundant. The river itself offers opportunities for fishing, kayaking, and rafting, particularly during the peak flow in the winter and spring. The surrounding forests provide ample hiking and camping opportunities, with trails leading to stunning viewpoints and waterfalls. Visitors can also explore nearby state and national parks, such as Redwood National and State Parks, to experience the awe-inspiring ancient redwood forests. Overall, Mad River is a captivating destination for outdoor enthusiasts seeking to immerse themselves in the natural beauty of Northern California.