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

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1889-06-0129.289000MajorC1 F1
1924-03-2928.482000MajorC1 F1
1932-05-1319.228200Minornone
1933-03-1417.823400Minornone
1936-03-1729.188200Majornone
1937-04-2624.251700Majornone
1937-10-2825.157400Majornone
1942-10-1524.0450500Majornone
1942-12-3017.1222200Minornone
1951-06-1317.6523100MinorF2
1954-10-1623.8538500MajorF2
1955-08-1822.634300ModerateF2
1960-03-3117.3422200MinorF2
1960-05-0817.3622200MinorF2
1961-02-2618.8425300MinorF2
1963-03-0517.9623500MinorF2
1963-03-2017.4222600MinorF2
1964-04-2919.4826600MinorF2
1967-03-0718.9125400MinorF2
1970-04-0217.2522200MinorF2
1978-07-0417.8523500MinorF2
1984-04-0517.623100MinorF2
1985-11-0518.8525500MinorF2
1993-04-1619.0525900MinorF2
1996-01-1925.5659200MajorF2
1996-09-0722.55-9999ModerateF2
2005-03-2917.8824100MinorF2
2009-05-0417.4323500MinorF2
2010-03-1317.4623500MinorF2



Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information 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: 07:20 AM Nov 12, 2013