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Trace America's Streams

Trace America's Streams using Streamer, by USGS

from the site:

The USGS National Geospatial Program is proud to announce the release of a dynamic map called Streamer, which allows a web user to map upstream and downstream traces and generate reports for each trace (including a map of the trace; its direction, total length, and outlet waterbody; its origin's stream name, coordinates, and elevation; and counts of the number of gages, streams, states, counties, and cities along the trace.)