MD-DE-DC Water Science Center


The water resources of Maryland, Delaware, and the District of Columbia consist of numerous streams, springs, lakes, and aquifer systems. Streamflow, groundwater levels, and water-quality data are collected at numerous locations, and water-use data are collected throughout the area in cooperation with other federal, state and local agencies, universities, and research centers...

Chesapeake Bay Activities

Chesapeake Bay Activities

The USGS has the critical role to provide scientific information for the improved understanding and management of the Bay ecosystem. The USGS works with Federal, State, and academic science partners to provide research, assessment, and monitoring.

USGS Chesapeake Bay

Local Water Conditions

Local Water Conditions

Explore real-time streamflow, groundwater, and water-quality conditions and access data for MD, DE, and DC with our new interactive map application. This application offers data displays on multiple device platforms with various basemap options.

Local Water Conditions


Featured below are some popular features on the MD-DE-DC Water Science site. To better navigate our pages, please use the vertical header listing to the left side of this window.

NEWS! Monthly Water Conditions

Water Conditions for Maryland

Water Conditions for Delaware

Water Conditions for Washington, DC

Recent Publications from MD-DE-DC

USGS Water Science Center Seminars & Talks

Maryland Storm-Tide Sensor Network

Jump into NWIS WEB!


USGS measures discharge at the Ohio River at Olmsted Lock and Dam
March 7, 2018

Crews from the U.S. Geological Survey have been in the field for weeks measuring flooding in the Midwest and in the Mississippi River watershed, and more recently flooding and storm tides on the Northern Atlantic coast, as higher temperatures, heavy rain, snowmelt and nor’easters affected numerous states. 

Baltimore Harbor Water Wheel (aka “Mr. Trash Wheel”)
October 14, 2016

Online sites will provide the first real-time, user-friendly Inner Harbor water information

Stream Gage in Maryland
July 13, 2016

Vital coastal storm-tide information needed to help guide storm response efforts following major storms affecting Maryland will be more accessible than ever due to a new monitoring network the U.S. Geological Survey is currently building.

For more information, see



Year Published: 2018

Factors affecting long-term trends in surface-water quality in the Gwynns Falls watershed, Baltimore City and County, Maryland, 1998–2016

Factors affecting water-quality trends in urban streams are not well understood, despite current regulatory requirements and considerable ongoing investments in gray and green infrastructure. To address this gap, long-term water-quality trends and factors affecting these trends were examined in the Gwynns Falls, Maryland, watershed during 1998–...

Majcher, Emily H.; Woytowitz, Ellen L.; Reisinger, Alexander J.; Groffman, Peter M.
Majcher, E.H., Woytowitz, E.L., Reisinger, A.J., and Groffman, P.M., 2018, Factors affecting long-term trends in surface-water quality in the Gwynns Falls watershed, Baltimore City and County, Maryland, 1998–2016: U.S. Geological Survey Open-File Report 2018–1038, 27 p.,

Year Published: 2017

Stormwater management network effectiveness and implications for urban watershed function: A critical review

Deleterious effects of urban stormwater are widely recognized. In several countries, regulations have been put into place to improve the conditions of receiving water bodies, but planning and engineering of stormwater control is typically carried out at smaller scales. Quantifying cumulative effectiveness of many stormwater control measures on a...

Jefferson, Anne J.; Bhaskar, Aditi S.; Hopkins, Kristina G.; Fanelli, Rosemary; Avellaneda, Pedro M.; McMillan, Sara K.
Jefferson AJ, Bhaskar AS, Hopkins KG, Fanelli R, Avellaneda PM, McMillan SK. 2017. Stormwater management network effectiveness and implications for urban watershed function: A critical review. Hydrological Processes. 1–25,

Year Published: 2017

Submersed aquatic vegetation in Chesapeake Bay: Sentinel species in a changing world

Chesapeake Bay has undergone profound changes since European settlement. Increases in human and livestock populations, associated changes in land use, increases in nutrient loadings, shoreline armoring, and depletion of fish stocks have altered the important habitats within the Bay. Submersed aquatic vegetation (SAV) is a critical foundational...

Orth, Robert J.; Dennison, William C.; Lefcheck, Jonathon S.; Gurbisz, Cassie; Hannam, Michael; Keisman, Jennifer; Landry, J. Brooke; Moore, Kenneth A.; Murphy, Rebecca R.; Patrick, Christopher J.; Testa, Jeremy; Weller, Donald E.; Wilcox, David J.
Robert J. Orth, William C. Dennison, Jonathan S. Lefcheck, Cassie Gurbisz, Michael Hannam, Jennifer Keisman, J. Brooke Landry, Kenneth A. Moore, Rebecca R. Murphy, Christopher J. Patrick, Jeremy Testa, Donald E. Weller, David J. Wilcox; Submersed Aquatic Vegetation in Chesapeake Bay: Sentinel Species in a Changing World, BioScience, Volume 67, Issue 8, 1 August 2017, Pages 698–712,