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USGS 01491000 CHOPTANK RIVER NEAR GREENSBORO, MD

PROVISIONAL DATA SUBJECT TO REVISION

Click to hidestation-specific text 

LOCATION.--Lat 38°59'49.9", long 75°47'08.9",
   Caroline County, MD, Hydrologic Unit 02060005, on right bank at highway bridge (removed),
   0.1 mi upstream from Gravelly Branch, 2.0 mi northeast of Greensboro, and 60 mi upstream
   from mouth.
DRAINAGE AREA.--113 mi2.
PERIOD OF RECORD.--January 1948 to current year.
REVISIONS HISTORY.--WSP 1622: 1948. WDR MD-DE-79-1: 1961(P).
GAGE.--Water-stage recorder, concrete control and crest-stage gage.  Datum of gage is 2.73 ft 
   above North American Vertical Datum of 1988.
REMARKS.--Diversions for irrigation of about 500 acres, upstream from station. U.S. Geological
   Survey satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 8,880 ft3/s, Aug. 28, 2011,
   gage height, 17.96 ft (from floodmark); minimum discharge, 0.26 ft3/s,  Aug. 19, 20, 2002.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in 1935 is believed to have been higher than that of
   Aug. 4, 1967, from information by local residents.
COOPERATION.--Funding for the operation of this station is provided by the Maryland Department 
   of Natural Resources, and the U.S Geological Survey.
This station managed by the MD-DE-DC Water Science Center Dover office.

Available Parameters Available Period
  
2023-04-20  2024-12-03
1990-10-01  2024-12-03
2007-10-01  2024-12-03
2023-04-20  2024-12-03
2023-04-20  2024-12-03
2023-04-20  2024-12-03
2023-04-20  2024-12-03
2023-08-01  2024-12-03







 (7)
 
  -- or --

 

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

Temperature, water, degrees Celsius
Most recent instantaneous value: 2.2 12-03-2024   11:30 EST
Graph of Temperature, water, degrees Celsius

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Discharge, cubic feet per second
Most recent instantaneous value: 14.5 12-03-2024   11:15 EST
Graph of Discharge, cubic feet per second

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Daily discharge, cubic feet per second -- statistics for Dec 3 based on 76 water years of record more
Min
(1966)		 Most Recent
Instantaneous
Value Dec 3		 25th
percen-
tile		 Median Mean 75th
percen-
tile		 Max
(2010)
12.0 14.5 36 77 121 132 861

Gage height, feet
Most recent instantaneous value: 2.17 12-03-2024   11:15 EST
Graph of Gage height, feet

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Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius
Most recent instantaneous value: 176 12-03-2024   11:30 EST
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Dissolved oxygen, water, unfiltered, milligrams per liter
Most recent instantaneous value: 13.1 12-03-2024   11:30 EST
Graph of Dissolved oxygen, water, unfiltered, milligrams per liter

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pH, water, unfiltered, field, standard units
Most recent instantaneous value: 7.4 12-03-2024   11:30 EST
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Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)
Most recent instantaneous value: 3.8 12-03-2024   11:30 EST
Graph of Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)

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Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen
Most recent instantaneous value: 1.47 12-03-2024   11:30 EST
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