The covered bridge over the Contoocook stays dark and cool inside even in September, and the river beneath it runs low and clear that time of year. Nash's Lawn Care works the streets along the water and the roads climbing away from them, mowing, trimming, edging walkways, and raking the maple leaves that begin dropping before the month is out. Riverbank lawns hold their moisture, so they keep growing after the hill lots have quit, and the season runs a little longer down there. There is a plain pride in the last cut of the year, sharp lines and clean edges with everything squared away ahead of the cold. Spring brings the whole thing around again with a cleanup and a first mow.