North Branch Potomac River near Cumberland, Allegany County MD (CBEM2)
Gage Location: Allegany County, Maryland	Site Location: Allegany County, Maryland
Latitude: 39.622	Longitude: -78.773	Elevation: 585.22 ft. MSL	Drainage Area: 877 Sq. Mi.
Minor Stage: 17 ft.	Moderate Stage: 21 ft.	Major Stage: 23 ft.
First Flood: 1889-06-01	Last Flood: 2010-03-13 Crest: 17.46 ft.	Datum change: 1929-06-18	Number of Floods: 29

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1889-06-01 29.2 89000 Major *** (B) 1924-03-29 28.4 82000 Major *** (B) 1932-05-13 19.2 28200 Minor none 1933-03-14 17.8 23400 Minor none 1936-03-17 29.1 88200 Major none 1937-04-26 24.2 51700 Major none 1937-10-28 25.1 57400 Major none 1942-10-15 24.04 50500 Major none 1942-12-30 17.12 22200 Minor none 1951-06-13 17.65 23100 Minor (A) 1954-10-16 23.85 38500 Major (A) 1955-08-18 22.6 34300 Moderate (A) 1960-03-31 17.34 22200 Minor (A) 1960-05-08 17.36 22200 Minor (A) 1961-02-26 18.84 25300 Minor (A) 1963-03-05 17.96 23500 Minor (A) 1963-03-20 17.42 22600 Minor (A) 1964-04-29 19.48 26600 Minor (A) 1967-03-07 18.91 25400 Minor (A) 1970-04-02 17.25 22200 Minor (A) 1978-07-04 17.85 23500 Minor (A) 1984-04-05 17.6 23100 Minor (6) 1985-11-05 18.85 25500 Minor (6) 1993-04-16 19.05 25900 Minor (6) 1996-01-19 25.56 59200 Major (6) 1996-09-07 22.55 -9999 Moderate (6) 2005-03-29 17.88 24100 Minor (6) 2009-05-04 17.43 23200 Minor (6) 2010-03-13 17.46 23500 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