The highway returns into Rochester and enters Lakeville between Little Quittacas and Great Quittacas Ponds. Route 18 joins Route 105 for a  concurrency, running along the western shore of Assawompset Pond.
A road that enters Rochester and traverses Lakeville, situated between two ponds, joins forces with Route 105 for a joint journey, tracing the western shoreline of Assawompset Pond.