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Open-File Report 2010–1207

Prepared in cooperation with the Maryland Geological Survey and the
Maryland Department of Natural Resources

Potentiometric Surface of the Lower Patapsco Aquifer in Southern Maryland, September 2009

By Stephen E. Curtin,1 David C. Andreasen,2 and Andrew W. Staley2

1U.S. Geological Survey, Baltimore, MD 21228.
2Maryland Geological Survey, Baltimore, MD 21218.
Thumbnail of front cover and link to report (457 KB)


This report presents a map showing the potentiometric surface of the lower Patapsco aquifer in the Patapsco Formation of Early Cretaceous age in Southern Maryland during September 2009. The map is based on water-level measurements in 64 wells. The highest measured water level was 110 feet above sea level near the northwestern boundary and outcrop area of the aquifer in northern Prince George’s County. From this area, the potentiometric surface declined towards well fields at Severndale, Broad Creek, and Arnold. The measured groundwater levels were 99 feet below sea level at Severndale, 50 feet below sea level at Broad Creek, and 36 feet below sea level at Arnold. There was also a cone of depression in Charles County that includes Waldorf, La Plata, Indian Head, and the Morgantown power plant. The groundwater levels measured were as low as 215 feet below sea level at Waldorf, 149 feet below sea level at La Plata, 121 feet below sea level at Indian Head, and 96 feet below sea level at the Morgantown power plant. The map also shows well yield in gallons per day for 2008 at wells or well fields.

First posted December 2010

For additional information, please contact:

U.S. Geological Survey
MD-DE-DC Water Science Center
5522 Research Park Drive
Baltimore, MD 21228
(443) 498-5500

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Acrobat® Reader, free of charge.

Suggested citation:
Curtin, S.E., Andreasen, D.C., and Staley, A.W., 2010, Potentiometric surface of the Lower Patapsco aquifer in southern Maryland, September 2009: U.S. Geological Survey Open-File Report 2010–1207, 1 sheet, available at

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