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New WQX 3.0 profiles are available at waterqualitydata.us/beta/. These profiles will contain recent USGS data added since March 11, 2024, which marks the beginning of limited accessibility for USGS data. Read more about the 3.0 profiles and associated changes here. This user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  NWIS >  USGS-MD >  USGS-01491000

CHOPTANK RIVER NEAR GREENSBORO, MD (USGS-01491000) site data in the Water Quality Portal

Data Provider: NWIS (Learn more about Water Quality Portal Data Providers)

This stream site, maintained by the USGS Maryland Water Science Center (identifier USGS-MD), has the name "CHOPTANK RIVER NEAR GREENSBORO, MD" and has the identifier USGS-01491000. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)02060005. See more details of this site the the USGS NWIS Web page for this site. This site has a drainage area of 113 sq mi.

This site is located in Caroline County County, Maryland at 38.99719444000000 degrees latitude and -75.7858056000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolated from MAP." and the accuracy is 1 seconds. This site is at an elevation of 2.73 feet and the accuracy of the elevation measurement, collected using the method "Interpolated from Digital Elevation Model" is .1 feet. The vertical coordinate reference system is NAVD88.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "USGS-01491000" into the "Site ID" box under Site Parameters

What other monitoring locations are upstream or downstream from this one?

Upstream and downstream locations

This map shows all Water Quality Portal stations that are 10 miles upstream (dashed dark blue) and 10 miles downstream (solid light blue) of this monitoring location (indicated by the large blue circle). The upstream and downstream functionality is provided by the Network Linked Data Index.

When were data collected at this location?

Periods of record for data characteristic groups

For a more detailed breakdown of data, go to the Monitoring Report at the EPA How's My Waterway Application
Characteristic Group Date Range*
Biological, Algae, Cyanobacteria 1995 - 2023
Biological, Algae, Phytoplankton 1974 - 2014
Biological, Algae, Phytoplankton, Cyanobacteria, Periphyton 1974 - 1980
Biological, Algae, Phytoplankton, Photosynthetic Pigments 1974 - 2023
Biological, Counts 1974 - 1981
Biological, Fish 2010 - 2014
Biological, Photosynthetic Pigments 1974 - 1980
Information 1975 - 2024
Inorganics, Major, Metals 1964 - 2023
Inorganics, Major, Non-metals 1964 - 2024
Inorganics, Minor, Metals 1964 - 2023
Inorganics, Minor, Non-metals 1964 - 2011
Microbiological 1969 - 1994
Nutrient 1964 - 2024
Organics, Other 1969 - 2024
Organics, PCBs 1977 - 1982
Organics, Pesticide 1975 - 1991
Physical 1964 - 2024
Radiochemical 1969 - 2011
Sediment 1972 - 2021
*Date ranges may contain gap years

What other information is available for this location?

Detailed Metadata

For the definitions of the metadata elements, please go to the Water Quality Portal user guide

Location Metadata Value
OrganizationIdentifier USGS-MD
OrganizationFormalName USGS Maryland Water Science Center
MonitoringLocationIdentifier USGS-01491000
MonitoringLocationName CHOPTANK RIVER NEAR GREENSBORO, MD
MonitoringLocationTypeName Stream
HUCEightDigitCode 02060005
DrainageAreaMeasure/MeasureValue 113
DrainageAreaMeasure/MeasureUnitCode sq mi
LatitudeMeasure 38.99719444000000
LongitudeMeasure -75.7858056000000
HorizontalAccuracyMeasure/MeasureValue 1
HorizontalAccuracyMeasure/MeasureUnitCode seconds
HorizontalCollectionMethodName Interpolated from MAP.
HorizontalCoordinateReferenceSystemDatumName NAD83
VerticalMeasure/MeasureValue 2.73
VerticalMeasure/MeasureUnitCode feet
VerticalAccuracyMeasure/MeasureValue .1
VerticalAccuracyMeasure/MeasureUnitCode feet
VerticalCollectionMethodName Interpolated from Digital Elevation Model
VerticalCoordinateReferenceSystemDatumName NAVD88
CountryCode US
StateCode 24
CountyCode 011
ProviderName NWIS