It's Almost a Mileage Marker
Common along rural highways are postmile markers, indicating the mileage of a route within a given county. This one's in Sonoma County, on California 128 just north of Geyserville.
Common along rural highways are postmile markers, indicating the mileage of a route within a given county. This one's in Sonoma County, on California 128 just north of Geyserville.