Seneca Creek at Dawsonville, Montgomery County MD (DAWM2)
Gage Location: Montgomery County, MarylandSite Location: Montgomery County, Maryland
Latitude: 39.128Longitude: -77.336Elevation: -9999 ft. MSLDrainage Area: 101 Sq. Mi.
Minor Stage: 7.5 ft. Moderate Stage: 11 ft.Major Stage: 16 ft.
First Flood: 1933-08-24Last Flood: 2013-01-31 Crest: 11.35 ft.Datum change: 2011-09-29Number of Floods: 54

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MINOR FLOODS
Date of FloodCrest(ft)
1933-08-2410.3
1942-10-168.31
1943-11-097.52
1946-06-027.73
1952-09-017.77
1952-11-229.78
1955-08-137.6
1957-12-218.35
1961-06-107.98
1964-01-097.51
1965-08-267.62
1966-09-148.12
1967-08-277.64
1969-09-048.26
1973-09-147.94
1973-12-267.95
1976-01-018.94
1976-10-098.42
1978-01-269.96
1979-10-0110.95
1982-06-138.02
1983-04-108.09
1984-03-297.92
1985-02-128.33
1987-09-098.96
1988-05-199.81
1989-05-0610.09
1990-10-239.03
1993-04-168.15
1993-11-2810.37
1996-10-198.49
1998-03-219.09
1999-09-167.95
2001-08-128.01
2002-05-279.26
2003-09-2310.52
2003-12-1110.4
2005-07-088.83
2006-06-2610.29
2006-11-179.99
2008-05-128.74
2009-05-267.65
2009-12-267.98
2011-10-138.3
2011-12-077.94
 MODERATE FLOODS
Date of FloodCrest(ft)
1956-07-2112.17
1975-09-2612.67
1979-09-0612.69
1996-06-1811.01
2011-09-0815.78
2012-10-3111.13
2013-01-3111.35
 MAJOR FLOODS
Date of FloodCrest(ft)
1971-09-1216.32
1972-06-2216.4
 MISSING
Date of FloodCrest(ft)



Categorical Floods by Month
MonthMinor
After
Datum		Minor
Total		Moderate
After
Datum		Moderate
Total		Major
After
Datum		Major
Total		Missing
After
Datum		Missing
Total
January03110000
February01000000
March02000000
April02000000
May05000000
June04010100
July01010000
August05000000
September07030100
October16110000
November04000000
December15000000


Categorical Floods by Season
SeasonMinorModerateMajorMissing
Fall17410
Winter9100
Spring9000
Summer10210


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: 08:09 AM Feb 08, 2013