Weather / Road Conditions

The climate features hot dry summers and cold moist winters with snow at higher elevations. Geography is varied in the Modoc Bioregion,with volcanic areas and wetlands to the west and high desert to the east. Lassen Volcanic National Park, which is studded with lakes and crowned by 10,457-foot Lassen Peak; Tule Lake, and Clear Lake National Wildlife Refuges, Ahjumawi Lava Springs State Park, and Lava Beds National Monument are on the western side. The eastern side, which resembles its neighbor, Nevada, has desert alkali lakes, Honey Lake Valley, and Modoc National Wildlife Refuge. The last volcanic activity at Mount Lassen was in 1915. More info on the Bioregion...

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California Department of Transportation Road Condition Reports


Caltrans Information Local Web Cams
California Highway Patrol

Alturas (170)
905 West C St., Alturas
(530) 233-2919

Road Conditions (by phone)
  • Weather Bureau: (530) 221-5613
  • Cal Trans: (800) 427-7623
  • Oregon Roads: (503) 588-2941
Snow Chain Requirements
  • R1 (Modified) - Single Axle Trucks
  • R1 -  All Trucks & Vehicles without snow tires.
  • R2 - All Single Axle Trucks & Vehicles with snow tires.
  • R3 - All Trucks & Vehicles & 4x4s with snow tires.