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

Click on table headers to sort

Date of Flood Crest(ft) Streamflow(cfs) Category Code 1889-06-02 58.3 630000 Major *** 1933-08-25 49.44 296000 Minor none 1936-03-19 60.73 787000 Major none 1940-04-02 53.33 432000 Moderate none 1942-05-24 49.63 307000 Minor none 1943-01-01 53.2 428000 Moderate none 1946-05-29 54.9 492000 Major none 1948-04-16 49.67 310000 Minor none 1950-03-30 49.29 298000 Minor none 1950-11-27 52.96 420000 Moderate none 1952-03-13 50.33 329000 Minor none 1956-03-10 50.25 325000 Minor none 1960-04-02 51.31 370000 Minor none 1961-02-27 51.82 386000 Minor none 1964-03-12 54.03 473000 Major none 1970-04-04 50.47 350000 Minor none 1972-06-23 64.54 1080000 Major (A) 1975-09-27 55.73 545000 Major (6) 1979-03-07 53.21 452000 Moderate (6) 1981-02-24 49.56 316000 Minor (6) 1984-02-16 53.49 458000 Moderate (6) 1986-03-16 51.52 384000 Minor (6) 1993-04-02 53.21 448000 Moderate (6) 1994-03-26 51.01 365000 Minor (6) 1996-01-21 56.8 601000 Major (6) 1998-01-10 50.17 336000 Minor none 2004-09-19 56.28 577000 Major none 2005-01-16 49.1 301000 Minor none 2005-03-30 50.25 339000 Minor none 2005-04-04 51.71 391000 Minor none 2006-06-29 52.53 421000 Moderate none 2008-03-06 50.62 352000 Minor none 2010-01-27 49.58 316000 Minor none 2011-03-12 52.86 434000 Moderate none 2011-04-29 51.15 370000 Minor none 2011-09-09 58.16 665000 Major 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