Not sure exactly what you are asking but if you are coming from the north you can reach Calistoga either via 101 just south of Cloverdale (Hwy 128) which is a pretty easy drive into the Napa Valley or head north off I80 just past Fairfield, CA on Hwy 12 to Hwy 29. Have not taken 128 out of Winters.
If you stay at the Napa Fairgrounds in Calistoga it is a Passport America park and should be good for up to 4 night for 1/2 off. Full hookups. Enjoy.
Bill and Debb---2010 CT Coachworks Siena 35V
1999 Jeep Cherokee Sport---Roadmaster Falcon 5250 -
1 Cavalon (Scooby)