Site information:

NE corner of Hwy 29 (Foothill Blvd) and Lincoln Ave, Calistoga

The gas station in the photo is the corner in the OHP directions and the approximate site of the cabin.  Nothing remains of the site, as far as I know.

~38.575297,-122.580319

Plaque information:

No plaque

OHP description:

David Hudson was one of the early pioneers who helped develop the upper portion of Napa Valley by purchasing land, clearing it, and planting crops and building homes. Hudson built his cabin in October 1845.

Registered 7/31/1959