Zone C-4 located in portions of Butte, Glenn, Lassen, Plumas, Shasta, and Tehama counties in the North-Central part of the state east of the I-5 corridor between Willows and Redding. This zone includes Lake Almanor and Lassen National Park.

Zone C-4 located in portions of Butte, Glenn, Lassen, Plumas, Shasta, and Tehama counties in the North-Central part of the state east of the I-5 corridor between Willows and Redding. This zone includes Lake Almanor and Lassen National Park.