A selling point to commissioners â about 90% of the visitors arrive by bus or shuttle. âI think itâs also important to acknowledge thatâs a business model we donât see a lot,â Commissioner Anne Cottrell said. âAnd it really helps address traffic issues in the valley.â Madonna winery is located on 4.4 acres at 5400 Old Sonoma Road. It is along Highway 12, the main road linking southern Napa County with southern Sonoma County. âI can assure you we will do our best to make the valley proud as the second-oldest wine-making family still producing wine today in the Napa Valley,â Taylor Bartolucci of the winery told commissioners.