Potomac River at Paw Paw, Allegany County MD (PAWW2)
Gage Location: Allegany County, Maryland	Site Location: Morgan County, West Virginia
Latitude: 39.539	Longitude: -78.457	Elevation: 487.88 ft. MSL	Drainage Area: 3129 Sq. Mi.
Minor Stage: 25 ft.	Moderate Stage: 28 ft.	Major Stage: 32 ft.
First Flood: 1877-11-24	Last Flood: 2011-05-19 Crest: 28.67 ft.	Datum change: 1939-03-25	Number of Floods: 40

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1877-11-24 45 -9999 Major *** (B) 1889-06-01 45 -9999 Major *** (B) 1905-04-07 43.5 -9999 Major *** 1924-05-13 43.5 -9999 Major *** (B) 1928-05-01 31.4 -9999 Moderate *** 1936-03-18 54 240000 Major *** 1939-02-04 28.2 66100 Moderate *** 1942-05-23 26.98 58500 Minor none 1942-10-16 38.36 111000 Major none 1942-12-30 26.52 56500 Minor none 1949-06-19 33.91 85200 Major none 1951-06-14 25.87 53400 Minor none 1954-03-02 25.06 50300 Minor none 1954-10-16 32.24 78100 Major none 1955-08-19 35.35 91600 Major none 1960-03-31 25.36 51400 Minor none 1960-05-09 28.27 62300 Moderate none 1962-03-22 27.01 57500 Minor none 1963-03-20 31.48 75000 Moderate none 1964-04-30 25.7 52700 Minor none 1967-03-08 30.24 70000 Moderate none 1972-06-23 28.83 64500 Moderate none 1973-12-28 26.41 55300 Minor none 1975-03-20 27.66 59900 Minor none 1976-10-10 30.52 71100 Moderate none 1978-03-15 26.43 54900 Minor none 1979-02-26 29.13 65300 Moderate none 1983-04-25 25.08 49900 Minor none 1984-02-15 27.54 59000 Minor none 1984-04-05 25.79 52500 Minor none 1985-11-05 53.58 235000 Major none 1986-03-20 27.86 54600 Minor none 1987-04-17 25.93 53000 Minor none 1993-04-17 30.62 71300 Moderate none 1996-01-20 40.86 122000 Major none 1996-09-07 43.45 140000 Major none 2003-09-20 27.91 60500 Minor none 2005-03-29 27.39 58500 Minor none 2009-05-05 25.94 53100 Minor none 2010-03-14 29.11 65200 Moderate none 2011-05-19 28.67 63400 Moderate 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