The old water mill on Main Street in Williamsville has watched a couple of centuries of Amherst winters, and the pattern has not changed much: wind, then squall, then a long quiet white morning. Canella Landscaping And Snowplowing runs snowplowing straight through it — driveways scraped clean, walkways shoveled, salt worked into the spots where meltwater refreezes at dusk. Lots get opened early so the day can start on time. There is a particular pleasure in arriving before the household does and leaving nothing behind but a bare drive and a line of salt. Winter here is long; the route is what makes it livable.