From Santa Rosa:

• Take Highway 101 North to River RD/Guerneville Exit
• Right on Mark West Springs Road for 5.4 miles
• Mark West Springs Road becomes Porter Creek Road; continue for 2.6 miles
• Slight Right onto Porter Creek Road for another 2 miles
• Left on Petrified Forest Road for 4.6 miles
• Right onto Foothill Blvd/CA 128 for 7.7 miles (becomes St. Helena Highway North)
• Left on Deer Park Road
• Slight Left onto Sanitarium Road