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Water Science for Maryland, Delaware and the District of Columbia

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Real Time MD Streamflow Real Time DE Streamflow
Map of real-time streamflow compared to historical streamflow for this day of the year.

Map Explanation

What is a percentile? more in the current MD-DE-DC Monthly Water Conditions Summary

The real-time data used to produce this map are provisional and have not been reviewed or edited. They may be subject to significant change. The map depicts streamflow conditions as measured at USGS gaging stations. The colors represent discharge as a percentile, which is computed from the period of record for the current day of the year. Only stations having at least 30 years of record are used.

Active real-time stations having more than 30 years of continuous record are shown as colored circles. Uncolored circles depict stations having less than 30 years of record, or that are currently not transmitting.

Note: Hold down the Shift key and click on Reload or Refresh to make sure you have the most recent image or table.

Drought Status


Drought status according to Maryland Department of the Environment. For more information, visit:



Department of Natural Resources and Environmental Control (DNREC)

District of Columbia

Metropolitan Washington Council of Governments (MWCOG):
Current Water Supply Report
Drought Stages

Drought Resources

Drought: Frequently Asked Questions
Drought Definitions

National Drought Monitoring

National Integrated Drought Information System (NIDIS)
National Climatic Data Center (NCDC)
US Drought Monitor

Weather and Climate

Northeast Regional Climate Center (NRCC)
NWS Sterling
NWS Philadelphia
Middle Atlantic River Forecast Center: MARFC Departures from Average
Maryland Weather Blog: The Baltimore Sun

Water Supply

Baltimore City
Delaware River Basin Commission (DRBC)
Interstate Commission on the Potomac River Basin
Susquehanna River Basin Commission (SRBC)
Washington Suburban Sanitary Commission (WSSC)

Water Conservation

Maryland Department of the Environment: Water Conservation
Water Wise Website
Use It Wisely

Related links

U.S. Environmental Protection Agency
GIS Drought Monitoring

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Page Last Modified: Thursday, March 09, 2017