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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:

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

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

Monthly Streamflow Conditions

Click on a triangle to display the 5-year hydrograph.Map of Maryland Antietam Creek near Sharpsburg, MD (01619500) Winters Run near Benson, MD (01581700) Nanticoke River near Bridgeville, DE (01487000) Morgan Creek near Kennedyville, MD (01493500) Deer Creek at Rocks, MD (01580000) Catoctin Creek near Middleton, MD (01637500) White Clay Creek near Newark, DE (01479000) Chicamacomico River near Salem, MD (01490000) Nassawango Creek near Snow Hill, MD (01485500) Patuxent River near Unity, MD (01591000) Potomac River at Point of Rocks, MD (01638500) Manokin Branch near Princess Anne, MD (01486000) Wills Creek near Cumberland, MD (01601500) Little Falls at Blue Mount, MD (01582000) Youghiogheny River near Oakland, MD (03075500) Potomac River near Hancock, MD (01613000) St. Jones River at Dover, DE (01483700) Pocomoke River near Willards, MD (01485000) Potomac River near Washington, DC (01646500) St Clement Creek near Clements, MD (01661050) Choptank River near Greensboro, MD (01491000) Beaver Run near Finksburg, MD (01586210) Monocacy River at Bridgeport, MD (01639000) Savage River near Barton, MD (01596500) Brandywine Creek at Wilmington, DE (01481500) Sallie Harris Creek near Carmichael, MD (01492500) Marsh Run at Grimes, MD Big Elk at Elk Mills, MD (01495000) Christina River at Cooches Bridge, DE (0147800) Conococheague Creek at Fairview, MD (01614500) Piscataway Creek at Piscataway, MD (01653600) Monocacy River at Jug Bridge near Frederick, MD (01643000) Bear Creek at Friendsville, MD (03076600)


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 Cooches 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 Clements 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


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