Streamer, a water features website operated by the National Atlas, allows you to trace the flow of most streams and rivers in the U.S., including those in New York State. If you zoom in to New York and then click on a stream it will provide you with a variety of information on the water feature. Below is one I did for the West Canada Creek in Herkimer County. I selected it to trace upstream (note the downstream versus upstream tabs at the top of the picture). The dialog box pops up if you hover your selection arrow over selection point on the map.
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