Susquehanna River at Marietta, Lancaster County PA (MRTP1)
Gage Location: Lancaster County, PennsylvaniaSite Location: Lancaster County, Pennsylvania
Latitude: 40.054Longitude: -76.531Elevation: 200.56 ft. MSLDrainage Area: 25990 Sq. Mi.
Minor Stage: 49 ft. Moderate Stage: 52 ft.Major Stage: 54 ft.
First Flood: 1889-06-02Last Flood: 2011-09-09 Crest: 58.16 ft.Datum change: 1931-10-01Number of Floods: 36

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1889-06-0258.3630000MajorC1
1933-08-2549.44296000Minornone
1936-03-1960.73787000Majornone
1940-04-0253.33432000Moderatenone
1942-05-2449.63307000Minornone
1943-01-0153.2428000Moderatenone
1946-05-2954.9492000Majornone
1948-04-1649.67310000Minornone
1950-03-3049.29298000Minornone
1950-11-2752.96420000Moderatenone
1952-03-1350.33329000Minornone
1956-03-1050.25325000Minornone
1960-04-0251.31370000Minornone
1961-02-2751.82386000Minornone
1964-03-1254.03473000Majornone
1970-04-0450.47350000Minornone
1972-06-2364.541080000MajorF2
1975-09-2755.73545000Majornone
1979-03-0753.21452000Moderatenone
1981-02-2449.56316000Minornone
1984-02-1653.49458000Moderatenone
1986-03-1651.52384000Minornone
1993-04-0253.21448000Moderatenone
1994-03-2651.01365000Minornone
1996-01-2156.8601000Majornone
1998-01-1050.17336000Minornone
2004-09-2056.28577000Majornone
2005-01-1649.1301000Minornone
2005-03-3050.25339000Minornone
2005-04-0451.71391000Minornone
2006-06-2952.53421000Moderatenone
2008-03-0650.63352000Minornone
2010-01-2749.58316000Minornone
2011-03-1252.86434000Moderatenone
2011-04-2951.15370000Minornone
2011-09-0958.16665000Majornone



Codes and description

C1|Crest information during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period 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: 07:31 AM Dec 19, 2014