Potomac River near Washington DC Little Falls pump station, Montgomery County MD (BRKM2)
Gage Location: Montgomery County, Maryland	Site Location: Montgomery County, Maryland
Latitude: 38.949	Longitude: -77.128	Elevation: 37.95 ft. MSL	Drainage Area: 11560 Sq. Mi.
Minor Stage: 10 ft.	Moderate Stage: 12 ft.	Major Stage: 14 ft.
First Flood: 1932-05-14	Last Flood: 2012-10-31 Crest: 10.33 ft.	Datum change: 1930-03-01	Number of Floods: 91

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1932-05-14 15.25 16800 Major none 1933-04-19 10.15 86700 Minor none 1933-04-22 12.8 127000 Moderate none 1933-08-25 10.57 92700 Minor none 1934-12-02 13.5 139000 Moderate none 1936-02-17 10.37 45000 Minor none 1936-02-27 14.69 132000 Major none 1936-03-13 11.16 106000 Minor none 1936-03-19 28.1 484000 Major none 1937-01-24 10.5 94400 Minor none 1937-02-23 10.58 96000 Minor none 1937-04-28 23.3 347000 Major none 1937-08-27 10.1 88300 Minor none 1937-10-30 15.62 181000 Major none 1939-02-05 12.6 129000 Moderate none 1940-04-22 11.29 107000 Minor none 1942-05-24 13.17 139000 Moderate none 1942-10-17 26.88 447000 Major none 1942-12-31 13.15 139000 Moderate none 1945-09-20 13.88 138000 Moderate none 1948-02-16 10.69 75000 Minor none 1948-04-16 10.69 97300 Minor none 1949-06-20 13 135000 Moderate none 1949-07-19 10.26 91300 Minor none 1950-02-03 10.01 77200 Minor none 1950-12-06 13.85 140000 Moderate none 1950-12-09 12.48 117000 Moderate none 1951-06-15 12.09 110000 Moderate none 1952-03-13 11.95 108000 Minor none 1952-04-29 14.17 148000 Major none 1952-11-23 13.76 140000 Moderate none 1953-03-26 11.44 99100 Minor none 1954-03-03 12.47 116000 Moderate none 1954-10-17 13.3 131000 Moderate none 1955-03-23 11.47 99500 Minor none 1955-08-20 17.6 216000 Major none 1956-04-09 10.46 68600 Minor none 1956-07-21 10.75 72500 Minor none 1957-02-12 11.1 74300 Minor none 1957-04-07 11.4 78600 Minor none 1958-03-01 10.18 49000 Minor none 1958-03-29 11.19 67200 Minor none 1958-05-07 12.02 82100 Moderate none 1960-04-01 12.29 102000 Moderate none 1960-04-06 13.35 119000 Moderate none 1960-05-10 13.66 124000 Moderate none 1961-02-21 13.15 116000 Moderate none 1961-02-27 12.23 101000 Moderate none 1961-04-14 11.71 92600 Minor none 1961-04-18 10.37 73200 Minor none 1962-03-01 11.05 82800 Minor none 1962-03-14 11.42 88300 Minor none 1962-03-23 13.43 120000 Moderate none 1963-03-07 12.87 111000 Moderate none 1963-03-15 11.64 91600 Minor none 1963-03-21 13.91 128000 Moderate none 1964-03-06 11.85 94800 Minor none 1964-05-01 11.59 90800 Minor none 1967-03-09 11.48 147000 Minor none 1972-06-24 22.03 359000 Major none 1973-12-28 10.36 120000 Minor none 1975-03-21 12.23 166000 Moderate none 1975-09-27 13.39 195000 Moderate (A) 1976-10-11 13.18 208000 Moderate none 1978-01-28 10.47 145000 Minor none 1978-03-16 10.83 153000 Minor none 1979-02-26 13.12 206000 Moderate none 1984-02-16 13.73 222000 Moderate none 1984-03-30 10.74 151000 Minor none 1985-11-07 17.99 317000 Major none 1986-03-16 10.09 136000 Minor none 1987-04-19 11.41 167000 Minor none 1993-03-06 12.35 189000 Moderate none 1993-03-25 10.16 138000 Minor none 1993-04-18 10.55 147000 Minor none 1993-11-29 10.09 136000 Minor none 1994-03-30 10.37 142000 Minor none 1996-01-21 19.29 347000 Major none 1996-09-08 17.84 314000 Major none 1998-01-10 10.43 144000 Minor none 1998-03-22 10.79 152000 Minor none 2003-09-21 11.44 167000 Minor none 2003-12-12 10.87 154000 Minor none 2005-03-30 10.28 140000 Minor none 2008-05-12 10.1 -9999 Minor none 2010-01-27 10.98 157000 Minor none 2010-03-15 12.9 201000 Moderate none 2011-03-12 10.88 154000 Minor none 2011-04-18 11.7 174000 Minor none 2011-05-19 11.4 166000 Minor none

MARFC Codes
Code Description
(!!!) Datum changed during this year.
(1) Backwater Effect.
(2) 15.77 ft also occurred on 11/25/1950 but only counted as one flood.
(3) Estimated from currrent USGS rating table.
(4) Estimated height from the USGS.
(5) Gage height at a different site and/or datum
(6) Discharge affected by Regulation or Diversion
(7) Due to changes, prior floods were based on present flood stage. Therefore, flood data could possibly be incomplete.
(8) Gage is a staff gage and not the offical USGS gage. Therefore, some floods may be missing from our study.
(9) Discharge effected by snow-melt, ice jam or debris jam break up
(A) Discharge affected to unknown degree by regulation or diversion.
(B) Month or day of occurrence is unknown or not exact.
(C) All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other factors.
(D) Crest height adjusted to current datum.
(E) Estimated discharge.
(F) Only annual maximum peak available for this year.
(O) This flood occurred at a previous flood stage that is lower than the current flood stage. This is only a historical flood.
** Crest information looks reasonable despite potential problems. This data was used in our study.
*** Crest information looks unreliable and incomplete and was not used in our flood frequency study.
**** Gauge was discontinued in 2004. 2004 and later was not used in our study.
none No code

Updated: 08:58 AM Jun 28, 2012