From USGS (July 2013):
Have you ever dropped a stick into a river and wondered where it might go if it floated all the way downstream? Now you can trace its journey using Streamer – a new on-line service from the National Atlas of the United States.
Streamer is an online map service that lets anyone trace downstream along America’s major rivers and streams simply by picking a point on a stream. Streamer will map the route the stream follows.
You can also trace upstream using Streamer. Imagine that you’re standing along the Mississippi River in New Orleans. You’re wondering not only where the river began but also which other streams drained into the Mississippi River before it made its way to your location. With Streamer you can also:
- locate your area of interest by specifying stream or place names; by entering latitude and longitude coordinates,
- enter the identification number for a U.S. Geological Survey streamflow gaging station,
- find out the names of streams and waterbodies by clicking on them,
- print maps of your downstream and upstream traces,
- create concise or detailed reports for your upstream and downstream traces,
- learn about current or historic streamflow at thousands of locations along America’s streams, and
- find out about the places your stream trace passes through with just a few mouse clicks.
Streamer is fueled by digital hydrographic data for America at one million-scale (an inch is approximately 15.8 miles on the land surface). These streams and water bodies are generalized from the highly detailed National Hydrography Dataset from The National Map
Streamer lets you navigate rivers in the United States the way other interactive maps help you drive your vehicle from one place to another. Unlike our nation’s road network, which provides many choices for traveling between two locations, America’s surface waters are somewhat like a network of one-way streets. You can certainly navigate upstream, but all water flows one way: downhill. Use Streamer to trace downstream along that downhill path or use Streamer to trace upstream to highlight rivers at higher elevations that flow to your starting point.
Direct to Streamer (via USGS)