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USGS 01661500 ST MARYS RIVER AT GREAT MILLS, MD

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION.--Lat 38°14'30.3", long 76°30'13.2", St. Marys County, MD, Hydrologic Unit 02070011, 
   on left bank at downstream side of bridge on State Highway 471 in Great Mills, 0.3 mi downstream
   from Western Branch, and 12.0 mi upstream from mouth.
DRAINAGE AREA.--24.0 mi2.
PERIOD OF RECORD.--June 1946 to September 2005, October 2006 to current year.
REVISIONS HISTORY.--WSP 1702: 1946, 1948-49, 1955, 1957-58. WDR MD-DE-83-1: 1981-82(M).
GAGE.--Water-stage recorder, crest-stage gage and concrete control. Datum of gage is 6.86 ft above 
   North American Vertical Datum of 1988.
REMARKS.--Occasional regulation by reservoir on Western Branch of St. Marys River, 2.0 mi upstream 
   since 1975, total capacity, 3,200 acre feet. U.S. Geological Survey satellite data-collection platform
   at station. Water-quality records for some prior periods have been collected at this location. 
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 7,950 ft3/s, Aug. 20, 1969,
   gage height, 13.34 ft; minimum discharge, 0.13 ft3/s, Aug. 10-14, 1999.
COOPERATION.--Funding for the operation of this station is provided by the Maryland Geological
   Survey, and the U.S. Geological Survey.
Boating safety tips
This station managed by the MD-DE-DC Water Science Center Baltimore office.

Available Parameters Available Period
  
1990-10-01  2020-07-15
2007-10-01  2020-07-15







 (7)
 

  -- or --

 


 

Summary of all available data for this site
Instantaneous-data availability statement


Discharge, cubic feet per second

Most recent instantaneous value: 8.65 07-15-2020   20:15 EDT
Graph of  Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Jul 15 based on 73 water years of record more
Min
(1986)
25th
percen-
tile
Median Most Recent
Instantaneous
Value Jul 15
75th
percen-
tile
Mean Max
(1959)
0.90 3.4 5 8.65 12 22 341


Gage height, feet

Most recent instantaneous value: 1.50 07-15-2020   20:15 EDT
Graph of  Gage height, feet

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