South Fork Shenandoah River near Lynnwood, Rockingham County VA (LYWV2)
Gage Location: Rockingham County, Virginia	Site Location: Rockingham County, Virginia
Latitude: 38.323	Longitude: -78.755	Elevation: 1013.17 ft. MSL	Drainage Area: 1079 Sq. Mi.
Minor Stage: 16 ft.	Moderate Stage: 17 ft.	Major Stage: 20 ft.
First Flood: 1934-12-01	Last Flood: 2011-04-17 Crest: 19.93 ft.	Datum change: 1930-09-30	Number of Floods: 32

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1934-12-01 21.62 45600 Major none 1936-03-18 26.57 77000 Major none 1937-04-26 20.48 39800 Major none 1940-08-17 19.86 33100 Moderate none 1942-05-16 16.97 23200 Minor none 1942-05-22 20.37 36300 Major none 1942-10-15 27.2 80000 Major none 1945-09-18 21.7 42800 Major none 1948-12-04 16.4 21500 Minor none 1949-06-18 23.6 53600 Major none 1950-12-04 16.2 20900 Minor none 1950-12-08 16.88 22900 Minor none 1955-08-18 22.94 46800 Major none 1971-05-30 19.43 31700 Moderate none 1972-06-22 23.45 50700 Major none 1972-10-06 21.92 42600 Major none 1975-03-19 20.44 35800 Major none 1976-10-09 17.99 26500 Moderate none 1978-01-26 16.74 22700 Minor none 1979-09-06 17.89 26200 Moderate none 1985-11-05 29.46 95100 Major none 1987-04-17 19.29 33900 Moderate none 1992-04-22 17.91 28700 Moderate none 1993-03-04 19.45 34500 Moderate none 1996-01-19 24.88 62500 Major none 1996-09-07 30.84 107000 Major none 1998-02-18 17.49 27600 Moderate none 2003-09-19 22.4 48400 Major none 2004-09-29 18.92 32900 Moderate none 2005-11-30 17.81 28700 Moderate none 2010-01-25 19.09 33600 Moderate none 2011-04-17 19.93 37000 Moderate 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