LINCOLN, R.I. — At the corner of Cynthia and Wilbur roads, there’s an intersection to the past and future. That changed last month, when neighbors said they found the stream dry and the milk house filled in with sand. Also called a spring house, the milk house has compartments that were once used to keep the farm’s milk, and sometimes watermelons, cool. Margenot, who has lived on nearby Lampercock Lane since 1993, said the spring house and stream always held water. On milking days, Phetteplace’s farmhands would carry containers of fresh milk down to the spring house to cool.