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| City | Mad River |
| State | California (CA) |
| County | Trinity |
| Country | United States of America |
| Timezone | Pacific Time (America/Los_Angeles) |
| Latitude | 40.452366 |
| Longitude | -123.509756 |
| Population | 272 |
| Density | 6.0 /km² |
| Incorporated | N/A |
| ZIP Code(s) | 95552 |
| Area Code | 530 |
| County Seat | Weaverville |
| School District | Southern Trinity Joint Unified School District |
Mad River is a locality in Trinity County, California, United States. It is a small community with a population of 272. The population density is 6.0 people per km². Mad River is located at 40.4524°N, 123.5098°W. It observes the Pacific Time (America/Los_Angeles) timezone. ZIP code: 95552.
Mad River begins as a whisper, a silver thread unspooling through emerald slopes. It lies 41.9 miles south-east of Eureka, CA (from Eureka, CA: bearing 125°T), and is situated 18.6 miles west-south-west of Hayfork. The air here carries the damp, pine-scented breath of ancient forests, a cool counterpoint to the sun’s persistent gaze. Rolling hills, cloaked in Douglas fir and redwood, cradle the valley, their shadows lengthening and deepening as the day wears on, hinting at the wilder country that lies beyond. The Mad River itself, a restless spirit, tumbles and churns, its waters clear and cold, reflecting the sky like shattered glass. Here, the land feels both immense and intimate, a place where the grandeur of nature presses close, softening the edges of human endeavor. The history of Mad River is written not in grand monuments but in the quiet persistence of those who have lived and worked its rugged terrain. Logging has long been the lifeblood, the scent of sawdust a familiar perfume on the breeze, a reminder of the timber that built homes and fortunes far from these secluded valleys. Though the logging trucks may rumble less frequently now, the spirit of resilience remains, echoing in the small businesses that line the main road and the independent farms that dot the hillsides. The river, once a highway for felled logs, now offers a different kind of bounty, its clear waters a draw for anglers and those seeking the simple solace of its banks. Mad River endures, a place where the past is a tangible presence, felt in the texture of the land and the quiet hum of daily life.
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This page provides an embedded street and satellite map of Mad River, California — switch between views using the small square in the bottom left-hand corner of the map. Coordinates: 40.452366, -123.509756. Live weather conditions are sourced directly from the National Weather Service, with current observations and a 7-day forecast also powered by Open-Meteo. Real-time local news and world news feeds keep the page current, while a Wikipedia summary or an editorially written description provides background on Mad River and Trinity County.
Detailed location data for Mad River includes the ZIP code (95552), telephone area code (530), county seat of Trinity County (Weaverville), and school district assignment (Southern Trinity Joint Unified School District). These are among the most commonly searched location details for any US city or town.
Location data is drawn from the USGS Geographic Names Information System (GNIS) and cross-verified against 2020 US Census records by coordinate proximity — ensuring the correct Mad River is identified even where the name is shared across multiple counties or states. Population figures are sourced from the 2020 US Census.
| Page generated | July 2026 |
| Location data | SimpleMaps US Cities Database; coordinates matched to USGS GNIS definitive data |
| Wikipedia validation | Article content matched to USGS GNIS coordinates via Wikipedia geosearch API. Location verified by proximity — not name matching alone. |