Potomac River near Washington DC Little Falls pump station, Montgomery County MD (BRKM2)
Gage Location: Montgomery County, MarylandSite Location: Montgomery County, Maryland
Latitude: 38.949Longitude: -77.128Elevation: 37.95 ft. MSLDrainage Area: 11560 Sq. Mi.
Minor Stage: 10 ft. Moderate Stage: 12 ft.Major Stage: 14 ft.
First Flood: 1932-05-14Last Flood: 2014-05-17 Crest: 11.7 ft.Datum change: 1930-03-01Number of Floods: 92

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1932-05-1415.25168000Majornone
1933-04-1910.1586700Minornone
1933-04-2212.8127000Moderatenone
1933-08-2510.5792700Minornone
1934-12-0213.5139000Moderatenone
1936-02-1710.3745000Minornone
1936-02-2714.69132000Majornone
1936-03-1311.16106000Minornone
1936-03-1928.1484000Majornone
1937-01-2410.594400Minornone
1937-02-2310.5896000Minornone
1937-04-2823.3347000Majornone
1937-08-2710.188300Minornone
1937-10-3015.62181000Majornone
1939-02-0512.6129000Moderatenone
1940-04-2211.29107000Minornone
1942-05-2413.17139000Moderatenone
1942-10-1726.88447000Majornone
1942-12-3113.15139000Moderatenone
1945-09-2013.88138000Moderatenone
1948-02-1610.6975000Minornone
1948-04-1610.6997300Minornone
1949-06-2013135000Moderatenone
1949-07-1910.2691300Minornone
1950-02-0310.0177200Minornone
1950-12-0613.85140000Moderatenone
1950-12-0912.48117000Moderatenone
1951-06-1512.09110000Moderatenone
1952-03-1311.95108000Minornone
1952-04-2914.17148000Majornone
1952-11-2313.76140000Moderatenone
1953-03-2611.4499100Minornone
1954-03-0312.47116000Moderatenone
1954-10-1713.3131000Moderatenone
1955-03-2311.4799500Minornone
1955-08-2017.6216000Majornone
1956-04-0910.4668600Minornone
1956-07-2110.7572500Minornone
1957-02-1211.174300Minornone
1957-04-0711.478600Minornone
1958-03-0110.1849000Minornone
1958-03-2911.1967200Minornone
1958-05-0712.0282100Moderatenone
1960-04-0112.29102000Moderatenone
1960-04-0613.35119000Moderatenone
1960-05-1013.66124000Moderatenone
1961-02-2113.15116000Moderatenone
1961-02-2712.23101000Moderatenone
1961-04-1411.7192600Minornone
1961-04-1810.3773200Minornone
1962-03-0111.0582800Minornone
1962-03-1411.4288300Minornone
1962-03-2313.43120000Moderatenone
1963-03-0712.87111000Moderatenone
1963-03-1511.6491600Minornone
1963-03-2113.91128000Moderatenone
1964-03-0611.8594800Minornone
1964-05-0111.5990800Minornone
1967-03-0911.48147000Minornone
1972-06-2422.03359000Majornone
1973-12-2810.36120000Minornone
1975-03-2112.23166000Moderatenone
1975-09-2713.39195000Moderatenone
1976-10-1113.18208000Moderatenone
1978-01-2810.47145000Minornone
1978-03-1610.83153000Minornone
1979-02-2613.12206000Moderatenone
1984-02-1613.73222000Moderatenone
1984-03-3010.74151000Minornone
1985-11-0717.99317000Majornone
1986-03-1610.09136000Minornone
1987-04-1911.41167000Minornone
1993-03-0612.35189000Moderatenone
1993-03-2510.16138000Minornone
1993-04-1810.55147000Minornone
1993-11-2910.09136000Minornone
1994-03-3010.37142000Minornone
1996-01-2119.29347000Majornone
1996-09-0817.84314000Majornone
1998-01-1010.43144000Minornone
1998-03-2210.79152000Minornone
2003-09-2111.44167000Minornone
2003-12-1210.87154000Minornone
2005-03-3010.28140000Minornone
2008-05-1310.04135000Minornone
2010-01-2710.98157000Minornone
2010-03-1512.82199000Moderatenone
2011-03-1210.88154000Minornone
2011-04-1811.69173000Minornone
2011-05-1911.4166000Minornone
2012-10-3110.33141000Minornone
2014-05-1711.7174000Minornone



Codes and description

C1|Crest information during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 01:25 PM Jul 21, 2014