Water Data

Monthly Water Conditions Report

April 2009: USGS Maryland-Delaware-DC Monthly Water Conditions Summary

Water Conditions Archives are available here.

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Surface Water

NOTE: The term surface water includes the rivers, streams, ponds, and lakes of Maryland, Delaware, and D.C. Data about these resources is available in either real-time or monthly.

Real-Time

Real-Time Streamflow Levels

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

Monthly Data

Streamflow

Current streamflow information maps are listed by county with 5 year information. Click the map below for more information. This information is based on readings from streamflow gages in the MD-DE-DC Water Science Center.

Freshwater Use and Withdrawals

During 2000, about 1,500 million gallons per day (Mgal/d) of freshwater was withdrawn from surface-water and ground-water sources in Maryland for a variety of uses including public-supply distribution (PS), commercial (CO), self-supplied domestic (DO), industrial (IN), mining (MI), thermoelectric power generation (TE), livestock watering (LV), aquaculture (AQ), and irrigation (IR). Click here for more information.

Flood Watch

Find Flood Info Here! Emergency links, current weather conditions, and archives from past tropical storms and other weather events

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Ground Water

Real Time

Real-Time Ground-Water Wells

Click the sites to view real-time data.

Monthly

Current ground-water information maps are listed by county, categorized by water table or confined aquifer, with 5 year information. This information is based on monthly readings from selected wells in the MD-DE-DC Water Science Center.

View Water-Table Wells or Confined Aquifer Wells..

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Chesapeake Bay

Click for the monthly estimated streamflow entering Chesapeake Bay.

More information about USGS activities concerning the Chesapeake Bay can be found at the USGS Chesapeake Bay studies homepage.

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Historical Water Data

National Water Conditions
Maps and animations of monthly streamflows

Surface-Water Data Retrieval (Daily streamflow and peak flows):

	Maryland		Delaware
	DC		Virginia

River Input Monitoring (Fall Line) stations

• Maryland - Susquehanna, Choptank, Patuxent, Potomac
• Virginia - Rappahannock, James, Pomunkey, Mattaponi, Appomattox

Surface Water Site Inventory

• What's new?
• Active continuous streamflow sites
• Discontinued continuous streamflow sites

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Weather and Climate Information

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Water Tools

CFS Calculator (Link opens a new window)
Convert values from cfs (cubic feet per second)

Real-Time Streamflow Regional Quick-Navigation

This feature allows the user to navigate through each real-time station in numerical sequence (Maryland and Delaware)

Click-through Graph Navigation

This feature allows the user to click through each real-time station, viewing only the latest streamflow charts (Maryland and Delaware)

Frequently Asked Questions

 

Water Watch

 

Click to see the latest image from our Webcam at the Conowingo Dam!

 

Related Information

For an explanation of stream gaging, see:

• U.S. Geological Survey Circular 1123
  Stream-Gaging Program of the U.S. Geological Survey
  by K. L. Wahl, W. O. Thomas, Jr., and R. M. Hirsch.
• PowerPoint Presentation: Data collection at U.S. Geological Survey Streamgages
  HTML Format | PowerPoint File [13.4 mb]

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