In Lucca you take the SS12 towards Abetone until you get to Borgo a Mozzano. Here follow the signs for Castelnuovo di Garfagnana. After about 10 Km you will find directions for factories Vallico.
Al Casale streams, accessed from the junction, signposted in the road "Lodovica" along for about 2 km. lovely road along the artificial lake formed by the river, and with some older tunnels.