The Contoocook runs straight through the middle of Henniker, under the covered footbridge, loud in April and glassy by July. C&C Landscaping LLC works the yards on both banks — mowing, trimming, edging, and the cleanups that bracket the growing season at either end. River-bottom ground grows grass in a hurry once the nights warm up, and the route tightens accordingly. They like the moment when the last pass is finished, the mower shuts off, and you can hear the water again. A straight edge along a Henniker walkway is worth every extra minute it takes.