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

Click on table headers to sort
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 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: 08:00 PM May 28, 2014