Upriver from Norwalk, one first reaches the town of Wilton and then the town of Ridgefield. These two towns, combined with the city of Norwalk, contain more than 78 percent of the watershed. Their western neighbors, New Canaan and Lewisboro (NY), contain nearly 16 percent, entirely within the sub-watershed of the Norwalk River’s largest tributary, the Silvermine River. The towns to the east, Weston and Redding, contain just 6 percent of the watershed. This is shown in more detail here. A wealth of online information is available concerning the upriver communities of Wilton, Ridgefield, Lewisboro, and Redding. For the entire county of Fairfield CT, an excellent online resource is the blue pages.