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Important for you to know:

  • New to WDFN: Find the water data available in WDFN using the new home page on https://waterdata.usgs.gov. Use our new landing page to discover data near you. Learn more here.
Beta

New feature: Mean (average) statistics tables for daily data at a location are now available. The team is working on shaking out bugs and improving the experience. Tell us how it's working for you!

Please note, this page uses a data service that is under active beta development and is subject to change. Improved handling of significant figures will be addressed in a future release. For more information regarding the calculation of statistics and other details, please visit the Statistics documentation page.

Potomac River Near Wash, DC Little Falls Pump Sta - 01646500Statistics for daily mean (average) data