The Rock River runs straight through the middle of Dixon, and in June the bank timber at Lowell Park leans out over the water as if trying to see downstream. Hey Tree Service works those river-town yards — pruning maples and walnuts, trimming limbs off the eaves and the alley lines, dropping the ones that have quit for good. A removal close to a house is a controlled thing here: rigged, lowered and stacked rather than simply felled. When wind crosses the river and lays timber across a driveway, they open the pavement first and work back toward the flower beds. Between the arch and the water, it is a town worth keeping in order under the canopy.