Our ER is easy to find. From Highway 20 or the Silverado Trail, follow the blue H signs up Deer Park Road to Sanitarium Road. Address: 10 Woodland Road St. Helena, CA 94574 From Napa Take Highway 29 or the Silverado Trail North to St. Helena. Turn right on Deer Park Road and follow the left-turn lane on to Sanitarium Road (look for the blue H sign). Go half a mile. St. Helena Hospital will be on your right. Follow the directional signs to the ER entrance. From Lake County Take Highway 29 South towards Calistoga (do not turn right on Tubbs Lane). Just before you get to Calistoga, turn left on the Silverado Trail and continue to Deer Park Road. Turn left on Deer Park Road and follow the left-turn lane on to Sanitarium Road (look for the blue H sign). Go half a mile. St. Helena Hospital will be on your right. Follow the directional signs to the ER entrance. From Santa Rosa or Sonoma Valley Take Calistoga Road or Mark West Springs Road eastbound to Petrified Forest Road and proceed toward Calistoga. Take Highway 20 South towards St. Helena. Turn left on Deer Park Road and follow the left-turn lane on to Sanitarium Road (look for the blue H sign). Go half a mile. St. Helena Hospital will be on your right. Follow the directional signs to the ER entrance.