Conestoga River at Lancaster, Lancaster County PA (LNCP1)
Gage Location: Lancaster County, Pennsylvania	Site Location: Lancaster County, Pennsylvania
Latitude: 40.05	Longitude: -76.278	Elevation: 245.63 ft. MSL	Drainage Area: 324 Sq. Mi.
Minor Stage: 11 ft.	Moderate Stage: 13 ft.	Major Stage: 15 ft.
First Flood: 1933-08-24	Last Flood: 2013-01-31 Crest: 12.77 ft.	Datum change: 1933-05-01	Number of Floods: 49

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1933-08-24 17.52 22800 Major none 1934-07-08 12.8 12600 Minor none 1934-09-30 14.04 15000 Moderate none 1942-05-23 15.12 17300 Major none 1942-08-18 11.6 10300 Minor none 1946-06-02 12.69 12400 Minor none 1955-08-19 12.11 11200 Minor none 1960-09-13 11.77 10600 Minor none 1971-02-14 12.08 11200 Minor none 1972-06-23 27.9 50300 Major none 1973-06-29 11.38 8830 Minor none 1976-01-27 12.84 12600 Minor none 1978-01-25 18.14 25300 Major none 1978-03-27 11.74 9060 Minor none 1979-01-21 12.25 9830 Minor none 1979-01-25 13.91 13000 Moderate none 1979-02-26 13.87 12900 Moderate none 1982-06-17 14.2 13600 Moderate none 1983-04-16 12.48 10200 Minor none 1983-12-13 11.92 9330 Minor none 1984-07-07 12.85 10800 Minor none 1985-02-12 12.7 10600 Minor (E) (4) 1986-07-27 13 11000 Moderate (E) (4) 1987-09-09 16.7 20500 Major none 1988-05-19 12.1 9600 Minor (E) (4) 1988-07-22 12 9500 Minor (E) (4) 1988-07-24 11.8 9200 Minor (E) (4) 1989-05-06 15.3 16300 Major none 1993-11-28 11.95 9060 Minor none 1993-12-05 13.95 12600 Moderate none 1996-01-20 12.26 9560 Minor (6) 1996-10-20 13.22 11200 Moderate none 1996-11-09 11.7 8700 Minor none 1996-12-14 11.9 9000 Minor (E) (4) 1999-09-17 16.39 17600 Major none 2000-03-22 14.14 12900 Moderate none 2003-06-21 11.66 8600 Minor none 2003-09-23 12.74 10400 Minor none 2004-02-07 11.09 7815 Minor none 2004-07-28 14.43 13500 Moderate none 2005-10-09 17.8 20800 Major none 2006-06-28 14.7 14000 Moderate none 2006-11-17 11.05 7760 Minor none 2007-03-02 12.95 10700 Minor none 2010-10-01 11.35 8180 minor none 2011-08-28 12.15 9370 Minor none 2011-09-08 21.3 -9999 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