The Spenceville Wildlife Area is located approximately 45 miles north of Sacramento and can be reached via Highway 65 from the town of Wheatland or Highway 20 from Marysville. The Spenceville Wildlife Area is comprised of 11,213 acres of gently rolling hills that are characteristic of the Sierra foothills. Two thirds of the wildlife area resides in Yuba County with the remaining third in Nevada County. The reserve extends 10 miles from north to south and 4 1/2 miles east to west. Beale Air Force Base and numerous private landowners border the area .