The colony is in an Himalayan Blackberry hedge along the south side of the Christmas Star Vineyard pond immediately adjacent to Westside Road.
Directions: From Highway 20 about 3.5 miles east of Highway 101 turn north on Potter Valley Road. In 2.25 miles turn left onto Westside Potter Valley Road. Continue 2.4 miles, and the pond is on the right side of the road about 1/4 mile beyond the cemetery. There is no good place to park, so it is best to park at the cemetery and walk the remaining distance. The colony can easily be observed from the shoulder of the road.
You can see a Google Earth sattelite image in the Gallery.