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Potomac River at Wisconsin Avenue (01647600)

How High is the Potomac River?

This gage records the height measurements of the Potomac River every 15 minutes and via satellite, transmits the data to the U.S. Geological Survey (USGS) website. This graph shows the daily rise and fall of the water level, which is influenced by the same tides that affect the ocean and the Chesapeake Bay, but the water here is fresh, not salty or even brackish. The datum is an arbitrary number unique to this streamgage. To get a text of the current river height, see WaterNow under resources.


To reach the webpage for this streamgage, click on the hydrograph or link to

At the upstream end of Georgetown Waterfront Park, along the Capital Crescent Trail, which is part of Rock Creek National Park, there is a streamgage operated by the U. S. Geological Survey (USGS) in cooperation with the U.S. Army Corps of Engineers and the National Park Service.The USGS has measured water levels on the Potomac River in Georgetown since 1935.

Why monitor streams and who uses USGS streamflow data?

How is the river height measured?

Potomac River Watershed

Georgetown Floods

History of the USGS Georgetown gage


Resources: USGS Water Data, WaterNow, and WaterAlert


U.S. Department of the Interior
U.S. Geological Survey

Wendy S. McPherson (

Maryland-Delaware-D.C. Water Science Center
5522 Research Park Drive
Baltimore MD, 21228


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Page Last Modified: Thursday, March 08, 2018