Maryland-Delaware-District of Columbia Streamflow

Monthly mean streamflow is calculated based on daily streamflow data. Streams were carefully selected to assess the response to climatic conditions. Criteria for selecting a streamflow site for assessing climatic conditions include:

Minimum period of record is 10 years of continuous data, real-time preferred
Watershed areas greater than 5 square miles
Streamflow is not regulated, or has relatively natural flow
Streamflow data reflect climatic conditions
The surrounding area and watershed are not urban

Additional surface water data is available at http://waterdata.usgs.gov/md/nwis/sw.

Click here to learn about below freezing air temperatures and streamflow

Monthly Streamflow Conditions

Click on a triangle to display the 5-year hydrograph. Map of Maryland

SITE NUMBER	SITE NAME	DRAINAGE AREA	WATERSHED	PERIOD OF RECORD
01619500	Antietam Creek near Sharpsburg, MD	281 square miles	Potomac River Basin	June 1897 to September 1905; August 1928 - present
03076600	Bear Creek at Friendsville, MD	48.9 square miles	Monongahela River Basin	October 1964 to current year.
01586210	Beaver Run near Finksburg, MD	14.0 square miles	Patapsco River Basin	October 1982 to current year.
01495000	Big Elk Creek at Elk Mills, MD	52.6 square miles	Elk River Basin	April 1932 to current year. Monthly discharge only for some periods.
01481500	Brandywine Creek at Wilmington, DE	314 square miles	Delaware River Basin	October 1946 - Present
01637500	Catoctin Creek near Middleton, MD	66.9 square miles	Potomac River Basin	August 1947 to current year.
01490000	Chicamacomico River near Salem, MD	15.0 square miles	Transquaking River Basin	April 1951 to September 1980 October 2000 to current year.
01491000	Choptank River near Greensboro, MD	113 square miles	Choptank River Basin	January 1948 to Present
01478000	Christina River at Coochs Bridge, DE	20.5 square miles	Delaware Bay Drainage	April 1943 to current year
01614500	Conococheague Creek at Fairview, MD	494 square miles	Potomac River Basin	June 1928 to Present
01580000	Deer Creek at Rocks, MD	94.4 square miles	Susquehanna River Basin	October 1926 to Present
01582000	Little Falls at Blue Mount, MD	52.9 square miles	Gunpowder River Basin	June 1944 to current year.
01486000	Manokin Branch near Princess Anne, MD	4.80 square miles	Pocomoke River Basin	April 1951 to September 1971; October 1974 to current year.
01617800	Marsh Run near Grimes, MD	18.9 square miles	Potomac River Basin	October 1963 to current year
01639000	Monocacy River at Bridgeport, MD	173 square miles	Potomac River Basin	May 1942 to Present
01643000	Monocacy River at Jug Bridge near Frederick, MD	817 square miles	Potomac River Basin	October 1929 to Present
01493500	Morgan Creek near Kennedyville, MD	12.7 square miles	Chester River Basin	May 1951 to September 2005 July 2006 to present.
01487000	Nanticoke River near Bridgeville, DE	75.4 square miles	Nanticoke River Basin	April 1943 to Present
01485500	Nassawango Creek near Snow Hill, MD	44.9 square miles	Pocomoke River Basin	December 1949 to Present
01591000	Patuxent River near Unity, MD	34.8 square miles	Patuxent River Basin	July 1944 to Present
01653600	Piscataway Creek at Piscataway, MD	39.5 square miles	Potomac River Basin	October 1965 to Present
01485000	Pocomoke River near Willards, MD	60.5 square miles	Pocomoke River Basin	December 1949 to Present
01638500	Potomac at Point of Rocks, MD	9,651 square miles	Potomac River Basin	February 1895 to Present
01646500	Potomac River near Washington, DC	11,560 square miles	Potomac River Basin	March 1930 to Present
01613000	Potomac River near Hancock, MD	4,090 square miles	Potomac River Basin	October 1932 to Present
01492500	Sallie Harris Creek near Carmichael, MD	8.09 square miles	Wye River Basin	June 1951 to September 1956. 1957-81. October 2000 to current year.
01596500	Savage River near Barton, MD	49.1 square miles	Potomac River Basin	September 1948 to Present
01661050	St Clement Creek near Clements, MD	18.5 square miles	Potomac River Basin	October 1968 to September 2005; October 2006 to present.
01483700	St Jones River at Dover, DE	31.9 square miles	St. Jones River Basin	January 1958 to Present
01479000	White Clay Creek near Newark, DE	89.1 square miles	Delaware River Basin	October 1931-to September 1936; June 1943 to September 1957; October 1959 to Present.
01601500	Wills Creek near Cumberland, MD	247 square miles	Potomac River Basin	May 1905 to July 1906; October 1929 to Present
01581700	Winters Run near Benson, MD	34.8 square miles	Bush River Basin	August 1967 to Present
03075500	Youghiogheny River near Oakland, MD	134 square miles	Monongahela River Basin	August 1941 to Present

Maryland-Delaware-District of Columbia Streamflow

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