(1857, CA-49-04) WNW of Petaluma, Sonoma County, CA. Western Av. SW 1.9 miles from jct with Petaluma Blvd in Petaluma, continue SW (curves NW) on Spring Hill Rd. 5.1 miles to the house on the W. side of the road. (07-2005, N38 14.54 W122 45.16) Photo by Vanessa Pritchard, submitted by Robert Kline.