Potomac River at Shepherdstown, Jefferson County WV (SHEW2)
Gage Location: Jefferson County, West Virginia	Site Location: Jefferson County, West Virginia
Latitude: 39.435	Longitude: -77.801	Elevation: 281 ft. MSL	Drainage Area: 5939 Sq. Mi.
Minor Stage: 15 ft.	Moderate Stage: 18 ft.	Major Stage: 22 ft.
First Flood: 1889-06-01	Last Flood: 2012-10-31 Crest: 19 ft.	Datum change: 1889-01-01	Number of Floods: 122

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Month Number of Floods After Datum Number of Floods Total Cumulative Total After Datum Cumulative Total January 9 9 9 9 February 16 16 25 25 March 31 31 56 56 April 21 21 77 77 May 14 14 91 91 June 6 6 97 97 July 0 0 97 97 August 1 1 98 98 September 4 4 102 102 October 7 7 109 109 November 3 3 112 112 December 10 10 122 122 Seasonal Totals Winter (Dec-Jan-Feb) 35 Spring (Mar-Apr-May) 66 Summer (Jun-Jul-Aug) 7 Fall (Sep-Oct-Nov) 14

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: 08:09 AM Feb 08, 2013