True to the mission of its founders, Northern Valley Indian Health’s central purpose is to provide health services to eligibl ... e American Indians and to the general public in the service areas of Colusa, Glenn, and Yolo counties and portions of Butte and Tehama counties. Medical, Dental, and Behavioral Health services are provided. NVIH has Medical and Dental clinics in Red Bluff, Willows, Woodland, Chico as well as a Mobile Dental Clinic. read more